diff --git a/apis/ttftcuts/atg/api/ATGAPI.java b/apis/ttftcuts/atg/api/ATGAPI.java
new file mode 100644
index 000000000..2119f4446
--- /dev/null
+++ b/apis/ttftcuts/atg/api/ATGAPI.java
@@ -0,0 +1,11 @@
+package ttftcuts.atg.api;
+
+import net.minecraft.world.World;
+
+public class ATGAPI {
+
+	public static boolean WorldIsATG(World world) {
+		return world.provider.terrainType.getWorldTypeName() == "ATG";
+	}
+	
+}
diff --git a/apis/ttftcuts/atg/api/ATGBiomes.java b/apis/ttftcuts/atg/api/ATGBiomes.java
new file mode 100644
index 000000000..66e477cad
--- /dev/null
+++ b/apis/ttftcuts/atg/api/ATGBiomes.java
@@ -0,0 +1,91 @@
+package ttftcuts.atg.api;
+
+import java.lang.reflect.Method;
+
+import ttftcuts.atg.api.events.ATGBiomeEvent;
+import ttftcuts.atg.api.events.ATGBiomeGroupAddEvent;
+import ttftcuts.atg.api.events.ATGBiomeGroupEvent;
+import ttftcuts.atg.api.events.ATGBiomeModEvent;
+import ttftcuts.atg.api.events.ATGBiomeModEvent.EventType;
+import ttftcuts.atg.api.events.ATGBiomeModRequestEvent;
+import ttftcuts.atg.api.events.ATGBiomeRequestEvent;
+
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraftforge.common.MinecraftForge;
+
+import com.google.common.base.Optional;
+
+public abstract class ATGBiomes {
+	
+	public static enum BiomeType { LAND, COAST, SEA }
+	
+	// Get ATG biomes
+	
+	public static BiomeGenBase getBiome(String biomeName) {
+		final ATGBiomeRequestEvent event = new ATGBiomeRequestEvent(biomeName);
+		MinecraftForge.EVENT_BUS.post(event);
+		if ( !event.biome.isPresent() ) {
+			return null;
+		}
+		return event.biome.get();
+	}
+	
+	// Add Biome Groups
+
+	public static void addBiomeGroup(BiomeType type, String name, double temp, double moisture, double height, double minHeight, double maxHeight, long salt) {
+		ATGBiomeGroupAddEvent event = new ATGBiomeGroupAddEvent(type, name, temp, moisture, height, minHeight, maxHeight, salt);
+		MinecraftForge.EVENT_BUS.post(event);
+		if ( event.response == ATGBiomeGroupAddEvent.ResponseType.FAILED ) {
+			// FAILED!
+		}
+	}
+	public static void addBiomeGroup(BiomeType type, String name, double temp, double moisture, double height, long salt) {
+		addBiomeGroup(type, name, temp, moisture, height, 0.0, 1.0, salt);
+	}
+	public static void addBiomeGroup(BiomeType type, String name, double temp, double moisture, double height) {
+		addBiomeGroup(type, name, temp, moisture, height, 0);
+	}
+	
+	// Manipulate biome groups
+	
+	public static void modGroupSuitability(BiomeType type, String name, double modifier) {
+		ATGBiomeGroupEvent event = new ATGBiomeGroupEvent( ATGBiomeGroupEvent.EventType.SUITABILITY, type, name, modifier );
+		MinecraftForge.EVENT_BUS.post(event);
+		if ( event.response == ATGBiomeGroupEvent.ResponseType.FAILED ) {
+			// FAILED!
+		}
+	}
+	
+	
+	// Registering Biomes
+	
+	public static void addBiome(BiomeType type, String group, BiomeGenBase biome, double weight) {
+		ATGBiomeEvent event = new ATGBiomeEvent( type, group, biome, null, weight);
+		MinecraftForge.EVENT_BUS.post(event);
+	}
+	
+	public static void replaceBiome(BiomeType type, String group, BiomeGenBase toReplace, BiomeGenBase replacement, double weight) {
+		ATGBiomeEvent event = new ATGBiomeEvent( type, group, replacement, toReplace, weight );
+		MinecraftForge.EVENT_BUS.post(event);
+	}
+	
+	// Sub-biomes
+	
+	public static void addSubBiome(BiomeGenBase biome, BiomeGenBase subBiome, double weight) {
+		ATGBiomeModEvent event = new ATGBiomeModEvent(ATGBiomeModEvent.EventType.SUBBIOME, biome, null, subBiome, weight);
+		MinecraftForge.EVENT_BUS.post(event);
+	}
+	
+	// Gen Mods
+	
+	public static void addGenMod(BiomeGenBase biome, IGenMod mod) {
+		ATGBiomeModEvent event = new ATGBiomeModEvent(ATGBiomeModEvent.EventType.GENMOD, biome, mod, null, 0);
+		MinecraftForge.EVENT_BUS.post(event);
+	}
+	
+	public static Optional<IGenMod> getGenMod(BiomeGenBase biome) {
+		ATGBiomeModRequestEvent event = new ATGBiomeModRequestEvent(biome);
+		MinecraftForge.EVENT_BUS.post(event);
+		return event.mod;
+	}
+}
diff --git a/apis/ttftcuts/atg/api/IGenMod.java b/apis/ttftcuts/atg/api/IGenMod.java
new file mode 100644
index 000000000..fc2b73ae8
--- /dev/null
+++ b/apis/ttftcuts/atg/api/IGenMod.java
@@ -0,0 +1,9 @@
+package ttftcuts.atg.api;
+
+import java.util.Random;
+
+public interface IGenMod {
+	public int modify( int height, Random random, double rawHeight );
+	
+	public double noiseFactor();
+}
diff --git a/apis/ttftcuts/atg/api/events/ATGBiomeEvent.java b/apis/ttftcuts/atg/api/events/ATGBiomeEvent.java
new file mode 100644
index 000000000..809a84a84
--- /dev/null
+++ b/apis/ttftcuts/atg/api/events/ATGBiomeEvent.java
@@ -0,0 +1,29 @@
+package ttftcuts.atg.api.events;
+
+import ttftcuts.atg.api.ATGBiomes.BiomeType;
+
+import com.google.common.base.Optional;
+
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraftforge.event.Event;
+
+public class ATGBiomeEvent extends Event {
+
+	public static enum ResponseType { NONE, ADDED, REPLACED, BAD_GROUP, FAILED };
+	
+	public BiomeType type;
+	public ResponseType response;
+	public String group;
+	public BiomeGenBase biome;
+	public BiomeGenBase replaced;
+	public double weight;
+	
+	public ATGBiomeEvent(BiomeType type, String group, BiomeGenBase biome, BiomeGenBase replaced, double weight) {
+		this.type = type;
+		this.group = group;
+		this.biome = biome;
+		this.replaced = replaced;
+		this.weight = weight;
+		this.response = ResponseType.NONE;
+	}
+}
diff --git a/apis/ttftcuts/atg/api/events/ATGBiomeGroupAddEvent.java b/apis/ttftcuts/atg/api/events/ATGBiomeGroupAddEvent.java
new file mode 100644
index 000000000..2dff34d71
--- /dev/null
+++ b/apis/ttftcuts/atg/api/events/ATGBiomeGroupAddEvent.java
@@ -0,0 +1,31 @@
+package ttftcuts.atg.api.events;
+
+import ttftcuts.atg.api.ATGBiomes.BiomeType;
+import net.minecraftforge.event.Event;
+
+public class ATGBiomeGroupAddEvent extends Event {
+
+	public static enum ResponseType { NONE, OK, FAILED };
+	
+	public BiomeType type;
+	public ResponseType response;
+	public String name;
+	public double temp;
+	public double moisture;
+	public double height;
+	public double minHeight;
+	public double maxHeight;
+	public long salt;
+
+	public ATGBiomeGroupAddEvent( BiomeType type, String name, double temp, double moisture, double height, double minHeight, double maxHeight, long salt) {
+		this.type = type;
+		this.name = name;
+		this.temp = temp;
+		this.moisture = moisture;
+		this.height = height;
+		this.minHeight = minHeight;
+		this.maxHeight = maxHeight;
+		this.salt = salt;
+		this.response = ResponseType.NONE;
+	}
+}
diff --git a/apis/ttftcuts/atg/api/events/ATGBiomeGroupEvent.java b/apis/ttftcuts/atg/api/events/ATGBiomeGroupEvent.java
new file mode 100644
index 000000000..8811b2107
--- /dev/null
+++ b/apis/ttftcuts/atg/api/events/ATGBiomeGroupEvent.java
@@ -0,0 +1,24 @@
+package ttftcuts.atg.api.events;
+
+import ttftcuts.atg.api.ATGBiomes.BiomeType;
+import net.minecraftforge.event.Event;
+
+public class ATGBiomeGroupEvent extends Event {
+
+	public static enum EventType { SUITABILITY };
+	public static enum ResponseType { NONE, OK, FAILED };
+	
+	public EventType type;
+	public BiomeType biomeType;
+	public ResponseType response;
+	public String name;
+	public double modifier;
+
+	public ATGBiomeGroupEvent( EventType type, BiomeType biomeType, String name, double modifier ) {
+		this.type = type;
+		this.biomeType = biomeType;
+		this.name = name;
+		this.modifier = modifier;
+		this.response = ResponseType.NONE;
+	}
+}
diff --git a/apis/ttftcuts/atg/api/events/ATGBiomeModEvent.java b/apis/ttftcuts/atg/api/events/ATGBiomeModEvent.java
new file mode 100644
index 000000000..81fea8d42
--- /dev/null
+++ b/apis/ttftcuts/atg/api/events/ATGBiomeModEvent.java
@@ -0,0 +1,25 @@
+package ttftcuts.atg.api.events;
+
+import ttftcuts.atg.api.IGenMod;
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraftforge.event.Event;
+
+public class ATGBiomeModEvent extends Event {
+
+	public static enum EventType { GENMOD, SUBBIOME }
+	
+	public EventType type;
+	public BiomeGenBase biome;
+	public IGenMod mod;
+	public BiomeGenBase subBiome;
+	public double weight;
+	
+	public ATGBiomeModEvent( EventType type, BiomeGenBase biome, IGenMod mod, BiomeGenBase subBiome, double weight ) {
+		
+		this.type = type;
+		this.biome = biome;
+		this.subBiome = subBiome;
+		this.mod = mod;
+		this.weight = weight;
+	}
+}
diff --git a/apis/ttftcuts/atg/api/events/ATGBiomeModRequestEvent.java b/apis/ttftcuts/atg/api/events/ATGBiomeModRequestEvent.java
new file mode 100644
index 000000000..40333997a
--- /dev/null
+++ b/apis/ttftcuts/atg/api/events/ATGBiomeModRequestEvent.java
@@ -0,0 +1,19 @@
+package ttftcuts.atg.api.events;
+
+import ttftcuts.atg.api.IGenMod;
+
+import com.google.common.base.Optional;
+
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraftforge.event.Event;
+
+public class ATGBiomeModRequestEvent extends Event {
+
+	public BiomeGenBase biome;
+	public Optional<IGenMod> mod;
+	
+	public ATGBiomeModRequestEvent(BiomeGenBase biome) {
+		this.biome = biome;
+		this.mod = Optional.absent();
+	}
+}
diff --git a/apis/ttftcuts/atg/api/events/ATGBiomeRequestEvent.java b/apis/ttftcuts/atg/api/events/ATGBiomeRequestEvent.java
new file mode 100644
index 000000000..1223b834b
--- /dev/null
+++ b/apis/ttftcuts/atg/api/events/ATGBiomeRequestEvent.java
@@ -0,0 +1,17 @@
+package ttftcuts.atg.api.events;
+
+import com.google.common.base.Optional;
+
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraftforge.event.Event;
+
+public class ATGBiomeRequestEvent extends Event {
+
+	public String biomeName;
+	public Optional<BiomeGenBase> biome;
+	
+	public ATGBiomeRequestEvent(String biomeName) {
+		this.biomeName = biomeName;
+		this.biome = Optional.absent();
+	}
+}
diff --git a/common/biomesoplenty/integration/ATG/GenModAbyss.java b/common/biomesoplenty/integration/ATG/GenModAbyss.java
new file mode 100644
index 000000000..e174f7905
--- /dev/null
+++ b/common/biomesoplenty/integration/ATG/GenModAbyss.java
@@ -0,0 +1,26 @@
+package biomesoplenty.integration.ATG;
+
+import java.util.Random;
+
+import ttftcuts.atg.api.IGenMod;
+
+public class GenModAbyss implements IGenMod {
+	
+	private static final double smooth = 0.4; // how much double height vs how much int height
+	private static final int cutoff = 45; // top of the shelves
+	private static final double slopefactor = 0.12; // 1/slopefactor blocks of real height shifts from "height" to "abyss" level.
+
+	@Override
+	public int modify(int height, Random random, double rawHeight) {
+		double heightmix = height * (1-smooth) + ( rawHeight*256 ) * smooth;
+		double factor = Math.min(1,Math.max(0, (cutoff-heightmix)*slopefactor));
+		double abyss = rawHeight*rawHeight;
+		return Math.max(5, (int)Math.round( (factor * abyss + (1-factor) * rawHeight) *256 ) );
+	}
+
+	@Override
+	public double noiseFactor() {
+		return 150.0;
+	}
+
+}
diff --git a/common/biomesoplenty/integration/ATG/GenModCanyonRavine.java b/common/biomesoplenty/integration/ATG/GenModCanyonRavine.java
new file mode 100644
index 000000000..b009dd3ae
--- /dev/null
+++ b/common/biomesoplenty/integration/ATG/GenModCanyonRavine.java
@@ -0,0 +1,21 @@
+package biomesoplenty.integration.ATG;
+
+import java.util.Random;
+
+import ttftcuts.atg.api.IGenMod;
+
+public class GenModCanyonRavine implements IGenMod {
+	
+	private final static double cutoff = 0.45;
+	
+	@Override
+	public int modify(int height, Random random, double rawHeight) {
+		return (int)Math.round(height * 0.6 + ((rawHeight - cutoff)*0.7+cutoff)*256*0.4);
+	}
+
+	@Override
+	public double noiseFactor() {
+		return 20.0;
+	}
+
+}
diff --git a/common/biomesoplenty/integration/ATG/GenModGlacier.java b/common/biomesoplenty/integration/ATG/GenModGlacier.java
new file mode 100644
index 000000000..6044e5f7d
--- /dev/null
+++ b/common/biomesoplenty/integration/ATG/GenModGlacier.java
@@ -0,0 +1,19 @@
+package biomesoplenty.integration.ATG;
+
+import java.util.Random;
+
+import ttftcuts.atg.api.IGenMod;
+
+public class GenModGlacier implements IGenMod {
+	
+	@Override
+	public int modify(int height, Random random, double rawHeight) {
+		return height + 3;
+	}
+
+	@Override
+	public double noiseFactor() {
+		return 1.0;
+	}
+
+}
diff --git a/common/biomesoplenty/integration/ATGIntegration.java b/common/biomesoplenty/integration/ATGIntegration.java
new file mode 100644
index 000000000..7dd26d0f6
--- /dev/null
+++ b/common/biomesoplenty/integration/ATGIntegration.java
@@ -0,0 +1,485 @@
+package biomesoplenty.integration;
+
+import biomesoplenty.api.Biomes;
+import biomesoplenty.integration.ATG.*;
+import net.minecraft.world.biome.BiomeGenBase;
+import ttftcuts.atg.api.ATGBiomes;
+import ttftcuts.atg.api.ATGBiomes.BiomeType;
+import ttftcuts.atg.api.IGenMod;
+
+public class ATGIntegration {
+	
+	static double nb = 0.1; // Modifier used for biomes that have their own group
+	static double[] tiers = { 1.0, 0.5, 0.3, 0.2, 0.1, 0.04 }; 
+	
+	static private BiomeType land = BiomeType.LAND;
+	static private BiomeType coast = BiomeType.COAST;
+	static private BiomeType sea = BiomeType.SEA;
+	
+	protected static void init() 
+	{
+		addSubBiomes();
+		addLandBiomesGroup();
+		addBeachBiomesGroup();
+		addOceanBiomesGroup();
+	}
+	
+	private static void addSubBiomes()
+	{
+		// ########################
+		// sub-biomes
+		// ########################
+		
+		ATGBiomes.addSubBiome(Biomes.meadow.get(), Biomes.meadowForest.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.canyon.get(), Biomes.canyonRavine.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.shrubland.get(), Biomes.shrublandForest.get(), 0.5);
+		ATGBiomes.addSubBiome(Biomes.ominousWoods.get(), Biomes.ominousWoodsThick.get(), 0.5);
+		ATGBiomes.addSubBiome(Biomes.pasture.get(), Biomes.pastureMeadow.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.pasture.get(), Biomes.pastureThin.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.timber.get(), Biomes.timberThin.get(), 0.5);
+		ATGBiomes.addSubBiome(Biomes.alps.get(), Biomes.alpsForest.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.alps.get(), Biomes.alpsBase.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.seasonalForest.get(), Biomes.seasonalSpruceForest.get(), 1.0);
+		ATGBiomes.addSubBiome(Biomes.field.get(), Biomes.fieldForest.get(), 1.0);
+	}
+	
+	private static void addLandBiomesGroup()
+	{
+		addForestBiomesGroup();
+		addJungleBiomesGroup();
+		addPlainsBiomesGroup();
+		addIcePlainsBiomesGroup();
+		addTaigaBiomesGroup();
+		addDesertBiomesGroup();
+		addShrublandBiomesGroup();
+		addBorealForestBiomesGroup();
+		addTundraBiomesGroup();
+		addSteppeBiomesGroup();
+		addSavannahBiomesGroup();
+		addTropicalShrublandBiomesGroup();
+		addWoodlandBiomesGroup();
+		addMesaBiomesGroup();
+		addSwamplandBiomesGroup();
+	}	
+		
+	private static void addForestBiomesGroup()
+	{
+		// ########################
+		// forest
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Forest", BiomeGenBase.forest, Biomes.forestNew.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Forest", Biomes.birchForest.get(), tiers[1]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.woodland.get(), tiers[1] * nb); // out of base group
+		ATGBiomes.addBiome(land, "Forest", Biomes.spruceWoods.get(), tiers[1] * nb); // out of base group
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Forest", Biomes.coniferousForest.get(), tiers[2] * nb); // out of base group
+		ATGBiomes.addBiome(land, "Forest", Biomes.temperateRainforest.get(), tiers[2] );
+		ATGBiomes.addBiome(land, "Forest", Biomes.redwoodForest.get(), tiers[2]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.mountain.get(), tiers[2]);
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Forest", Biomes.mapleWoods.get(), tiers[3]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.seasonalForest.get(), tiers[3]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.borealForest.get(), tiers[3] * nb); // out of base group
+		ATGBiomes.addBiome(land, "Forest", Biomes.deciduousForest.get(), tiers[3]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.highland.get(), tiers[3] * nb); // out of base group
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Forest", Biomes.deadForest.get(), tiers[4]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.grove.get(), tiers[4]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.timber.get(), tiers[4]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.thicket.get(), tiers[4]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.shield.get(), tiers[4]);
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Forest", Biomes.fungiForest.get(), tiers[5]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.cherryBlossomGrove.get(), tiers[5]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.mysticGrove.get(), tiers[5]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.hotSprings.get(), tiers[5]);
+		ATGBiomes.addBiome(land, "Forest", Biomes.originValley.get(), tiers[5] * 0.5); // better at lowland?
+	}
+	
+	private static void addJungleBiomesGroup()
+	{
+		// ########################
+		// Jungle
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Jungle", BiomeGenBase.jungle, Biomes.jungleNew.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Jungle", Biomes.tropicalRainforest.get(), tiers[1]);
+		ATGBiomes.addBiome(land, "Jungle", Biomes.rainforest.get(), tiers[1]);
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Jungle", Biomes.tropics.get(), tiers[2]);
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Jungle", Biomes.bambooForest.get(), tiers[3]);
+		ATGBiomes.addBiome(land, "Jungle", Biomes.jadeCliffs.get(), tiers[3]);
+		
+		// tier 5
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Jungle", Biomes.sacredSprings.get(), tiers[5]);
+	}
+	
+	private static void addPlainsBiomesGroup()
+	{
+		// ########################
+		// Plains
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Plains", BiomeGenBase.plains, Biomes.plainsNew.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Plains", Biomes.shrubland.get(), tiers[1] * nb); // out of base group
+		ATGBiomes.addBiome(land, "Plains", Biomes.chaparral.get(), tiers[1]);
+		ATGBiomes.addBiome(land, "Plains", Biomes.prairie.get(), tiers[1]);
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Plains", Biomes.field.get(), tiers[2]);
+		ATGBiomes.addBiome(land, "Plains", Biomes.grassland.get(), tiers[2]);
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Plains", Biomes.pasture.get(), tiers[3]);
+		ATGBiomes.addBiome(land, "Plains", Biomes.meadow.get(), tiers[3]);
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Plains", Biomes.orchard.get(), tiers[4]);
+		ATGBiomes.addBiome(land, "Plains", Biomes.overgrownGreens.get(), tiers[4]);
+		ATGBiomes.addBiome(land, "Plains", Biomes.lavenderFields.get(), tiers[4]);
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Plains", Biomes.garden.get(), tiers[5]);
+	}
+	
+	private static void addIcePlainsBiomesGroup()
+	{
+		// ########################
+		// Ice Plains
+		// ########################
+		
+		// tier 1
+		ATGBiomes.addBiome(land, "Ice Plains", Biomes.alps.get(), tiers[0]);
+		
+		// tier 2
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Ice Plains", Biomes.polar.get(), tiers[2]);
+		ATGBiomes.addBiome(land, "Ice Plains", Biomes.glacier.get(), tiers[2]);
+		ATGBiomes.addGenMod(Biomes.glacier.get(), new GenModGlacier());
+		ATGBiomes.addBiome(land, "Ice Plains", Biomes.arctic.get(), tiers[2]);
+		
+		// tier 4
+		
+		// tier 5
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Ice Plains", Biomes.icyHills.get(), tiers[5]);
+	}
+	
+	private static void addTaigaBiomesGroup()
+	{
+		// ########################
+		// Taiga
+		// ########################
+				
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Taiga", BiomeGenBase.taiga, Biomes.taigaNew.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Taiga", Biomes.alpsForest.get(), tiers[1]);
+		ATGBiomes.addBiome(land, "Taiga", Biomes.coniferousForestSnow.get(), tiers[1]);
+		ATGBiomes.addBiome(land, "Taiga", Biomes.frostForest.get(), tiers[1]);
+		
+		// tier 3
+		
+		// tier 4
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Taiga", Biomes.deadForestSnow.get(), tiers[4]);
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Taiga", Biomes.icyHills.get(), tiers[5] * nb);
+	}
+	
+	private static void addDesertBiomesGroup()
+	{
+		// ########################
+		// Desert
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Desert", BiomeGenBase.desert, Biomes.desertNew.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Desert", Biomes.dunes.get(), tiers[1]);
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Desert", Biomes.outback.get(), tiers[2]);
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Desert", Biomes.lushDesert.get(), tiers[3]);
+		
+		// tier 5
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Desert", Biomes.oasis.get(), tiers[5]);
+	}
+	
+	private static void addShrublandBiomesGroup()
+	{
+		// ########################
+		// Shrubland
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Shrubland", ATGBiomes.getBiome("Shrubland"), Biomes.shrubland.get(), tiers[0]);
+		
+		// tier 2
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Shrubland", Biomes.heathland.get(), tiers[2]);
+		
+		// tier 4
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Shrubland", Biomes.thicket.get(), tiers[4]);
+		
+		// tier 6
+		
+	}
+	
+	private static void addBorealForestBiomesGroup()
+	{
+		// ########################
+		// Boreal Forest
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Boreal Forest", ATGBiomes.getBiome("BorealForest"), Biomes.borealForest.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Boreal Forest", Biomes.coniferousForest.get(), tiers[1]);
+		ATGBiomes.addBiome(land, "Boreal Forest", Biomes.spruceWoods.get(), tiers[1]);
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Boreal Forest", Biomes.forestNew.get(), tiers[2] * nb); // out of base group
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Boreal Forest", Biomes.shield.get(), tiers[3]);
+		ATGBiomes.addBiome(land, "Boreal Forest", Biomes.timber.get(), tiers[3]);
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Boreal Forest", Biomes.deadForest.get(), tiers[4]);
+		
+		// tier 6
+		
+	}
+		
+	private static void addTundraBiomesGroup()
+	{
+		// ########################
+		// Tundra
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Tundra", ATGBiomes.getBiome("Tundra"), Biomes.tundra.get(), tiers[0]);
+		
+		// tier 2
+				
+		// tier 3
+		ATGBiomes.addBiome(land, "Tundra", BiomeGenBase.icePlains, tiers[2]);
+		
+		// tier 4
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Tundra", Biomes.borealForest.get(), tiers[4] * nb); // out of base group
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Tundra", Biomes.steppe.get(), tiers[5]);
+	}
+	
+	private static void addSteppeBiomesGroup()
+	{
+		// ########################
+		// Steppe
+		// ########################
+		
+		// tier 1
+		
+		// tier 2
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Steppe", Biomes.crag.get(), tiers[2]);
+		
+		// tier 4
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Steppe", Biomes.mountain.get(), tiers[4]);
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Steppe", Biomes.deadForest.get(), tiers[5]);
+	}
+	
+	private static void addSavannahBiomesGroup()
+	{
+		// ########################
+		// Savannah
+		// ########################
+		
+		// tier 1
+		ATGBiomes.replaceBiome(land, "Savanna", ATGBiomes.getBiome("Savanna"), Biomes.savanna.get(), 1.0);
+		
+		// tier 2
+		
+		// tier 3
+		ATGBiomes.addBiome(land, "Savanna", Biomes.scrubland.get(), tiers[2]);
+		ATGBiomes.addBiome(land, "Savanna", Biomes.outback.get(), tiers[2] * nb); // out of base group
+		ATGBiomes.addBiome(land, "Savanna", Biomes.steppe.get(), tiers[2]);
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Savanna", Biomes.lushDesert.get(), tiers[3]);
+		
+		// tier 5
+		ATGBiomes.addBiome(land, "Savanna", Biomes.brushland.get(), tiers[4]);
+		
+		// tier 6
+		
+	}
+	
+	private static void addTropicalShrublandBiomesGroup()
+	{
+		// ########################
+		// Tropical Shrubland
+		// ########################
+		
+		// tier 1
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Tropical Shrubland", Biomes.tropics.get(), tiers[1]);
+		
+		// tier 3
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Tropical Shrubland", Biomes.bambooForest.get(), tiers[3]);
+		
+		// tier 5
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Tropical Shrubland", Biomes.sacredSprings.get(), tiers[5]);
+	}
+		
+	private static void addWoodlandBiomesGroup()
+	{
+		// ########################
+		// Woodland
+		// ########################
+		
+		// tier 1
+		
+		// tier 2
+		ATGBiomes.addBiome(land, "Woodland", Biomes.woodland.get(), tiers[1]);
+		
+		// tier 3
+		
+		// tier 4
+		ATGBiomes.addBiome(land, "Woodland", Biomes.thicket.get(), tiers[3]);
+		
+		// tier 5
+		
+		// tier 6
+		ATGBiomes.addBiome(land, "Woodland", Biomes.birchForest.get(), tiers[5]);
+	}
+		
+	private static void addMesaBiomesGroup()
+	{
+		// ########################
+		// Mesa
+		// ########################
+		
+		ATGBiomes.addBiome(land, "Mesa", Biomes.badlands.get(), tiers[0]);
+		ATGBiomes.addBiome(land, "Mesa", Biomes.canyon.get(), tiers[0]);
+		
+		ATGBiomes.addGenMod(Biomes.canyonRavine.get(), new GenModCanyonRavine());
+	}
+	
+	private static void addSwamplandBiomesGroup()
+	{
+		// ########################
+		// Swampland
+		// ########################
+		
+		// tier 1
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.wetland.get(), tiers[0]);
+		
+		// tier 2
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.marsh.get(), tiers[1]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.lushSwamp.get(), tiers[1]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.bayou.get(), tiers[1]);
+					
+		// tier 3
+		ATGBiomes.replaceBiome(coast, "Swampland", BiomeGenBase.swampland, Biomes.swamplandNew.get(), tiers[2]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.fen.get(), tiers[2]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.bog.get(), tiers[2]);
+		
+		// tier 4
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.moor.get(), tiers[3]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.deadSwamp.get(), tiers[3]);
+					
+		// tier 5
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.quagmire.get(), tiers[4]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.sludgepit.get(), tiers[4]);
+		
+		// tier 6
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.ominousWoods.get(), tiers[5]);
+		ATGBiomes.addBiome(coast, "Swampland", Biomes.silkglades.get(), tiers[5]);
+			
+		// swamp modifiers
+		IGenMod swampmod = ATGBiomes.getGenMod(BiomeGenBase.swampland).get();
+		ATGBiomes.addGenMod(Biomes.wetland.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.lushSwamp.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.bayou.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.swamplandNew.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.fen.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.bog.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.moor.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.deadSwamp.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.quagmire.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.sludgepit.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.ominousWoods.get(), swampmod);
+		ATGBiomes.addGenMod(Biomes.silkglades.get(), swampmod);
+	}
+	
+	private static void addBeachBiomesGroup()
+	{
+		// ########################
+		// Beaches
+		// ########################
+		
+		ATGBiomes.addBiome(coast, "Beach", Biomes.beachOvergrown.get(), 0.2);
+		
+		ATGBiomes.replaceBiome(coast, "Gravel Beach", ATGBiomes.getBiome("GravelBeach"), Biomes.beachGravel.get(), 1.0);
+	}
+		
+	private static void addOceanBiomesGroup()
+	{
+		// ########################
+		// Oceans
+		// ########################
+				
+		ATGBiomes.addBiome(sea, "Ocean", Biomes.oceanCoral.get(), 0.05);
+		ATGBiomes.addBiome(sea, "Ocean", Biomes.oceanKelp.get(), 0.1);
+				
+		ATGBiomes.replaceBiome(sea, "Deep Ocean", BiomeGenBase.ocean, Biomes.oceanAbyss.get(), 1.0);
+		ATGBiomes.addGenMod(Biomes.oceanAbyss.get(), new GenModAbyss());
+	}
+}
diff --git a/common/biomesoplenty/integration/BOPCrossIntegration.java b/common/biomesoplenty/integration/BOPCrossIntegration.java
index 2e9de2f32..ef28cdd3d 100644
--- a/common/biomesoplenty/integration/BOPCrossIntegration.java
+++ b/common/biomesoplenty/integration/BOPCrossIntegration.java
@@ -88,5 +88,16 @@ public class BOPCrossIntegration {
 				e.printStackTrace(System.err);
 			}
 		}
+		
+		if (Loader.isModLoaded("ATG"))
+		{
+			try {
+				ATGIntegration.init();
+			}
+			catch (Exception e) {
+				System.out.println("[BiomesOPlenty] There was an error while integrating Alternate Terrain Generation with Biomes O' Plenty!");
+				e.printStackTrace(System.err);
+			}
+		}
 	}
 }