diff --git a/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java b/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java
index aaf042ec..0e8c74a7 100644
--- a/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java
+++ b/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java
@@ -30,6 +30,7 @@ import net.minecraft.world.level.levelgen.SurfaceRules;
 import net.minecraft.world.level.levelgen.carver.ConfiguredWorldCarver;
 import net.minecraft.world.level.levelgen.feature.ConfiguredStructureFeature;
 import net.minecraft.world.level.levelgen.placement.PlacedFeature;
+import ru.bclib.api.surface.SurfaceRuleBuilder;
 import ru.bclib.entity.BCLEntityWrapper;
 import ru.bclib.util.ColorUtil;
 import ru.bclib.world.biomes.BCLBiome;
diff --git a/src/main/java/ru/bclib/api/biomes/SurfaceRuleBuilder.java b/src/main/java/ru/bclib/api/surface/SurfaceRuleBuilder.java
similarity index 99%
rename from src/main/java/ru/bclib/api/biomes/SurfaceRuleBuilder.java
rename to src/main/java/ru/bclib/api/surface/SurfaceRuleBuilder.java
index 13082e90..97698d1a 100644
--- a/src/main/java/ru/bclib/api/biomes/SurfaceRuleBuilder.java
+++ b/src/main/java/ru/bclib/api/surface/SurfaceRuleBuilder.java
@@ -1,4 +1,4 @@
-package ru.bclib.api.biomes;
+package ru.bclib.api.surface;
 
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
@@ -8,6 +8,7 @@ import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.levelgen.SurfaceRules;
 import net.minecraft.world.level.levelgen.SurfaceRules.RuleSource;
 import net.minecraft.world.level.levelgen.placement.CaveSurface;
+import ru.bclib.api.biomes.BiomeAPI;
 
 import java.util.Collections;
 import java.util.List;
diff --git a/src/main/java/ru/bclib/api/biomes/SurfaceRuleEntry.java b/src/main/java/ru/bclib/api/surface/SurfaceRuleEntry.java
similarity index 95%
rename from src/main/java/ru/bclib/api/biomes/SurfaceRuleEntry.java
rename to src/main/java/ru/bclib/api/surface/SurfaceRuleEntry.java
index 348dbbfb..7255631c 100644
--- a/src/main/java/ru/bclib/api/biomes/SurfaceRuleEntry.java
+++ b/src/main/java/ru/bclib/api/surface/SurfaceRuleEntry.java
@@ -1,4 +1,4 @@
-package ru.bclib.api.biomes;
+package ru.bclib.api.surface;
 
 import net.minecraft.world.entity.Mob;
 import net.minecraft.world.level.levelgen.SurfaceRules;
diff --git a/src/main/java/ru/bclib/api/surface/rules/RandomIntProvider.java b/src/main/java/ru/bclib/api/surface/rules/RandomIntProvider.java
new file mode 100644
index 00000000..14c1dffb
--- /dev/null
+++ b/src/main/java/ru/bclib/api/surface/rules/RandomIntProvider.java
@@ -0,0 +1,12 @@
+package ru.bclib.api.surface.rules;
+
+import ru.bclib.interfaces.NumericProvider;
+import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
+import ru.bclib.util.MHelper;
+
+public record RandomIntProvider(int range) implements NumericProvider {
+	@Override
+	public int getNumber(SurfaceRulesContextAccessor context) {
+		return MHelper.RANDOM.nextInt(range);
+	}
+}
diff --git a/src/main/java/ru/bclib/api/biomes/SurfaceNoiseCondition.java b/src/main/java/ru/bclib/api/surface/rules/SurfaceNoiseCondition.java
similarity index 96%
rename from src/main/java/ru/bclib/api/biomes/SurfaceNoiseCondition.java
rename to src/main/java/ru/bclib/api/surface/rules/SurfaceNoiseCondition.java
index 2b6b71ef..8efd4f92 100644
--- a/src/main/java/ru/bclib/api/biomes/SurfaceNoiseCondition.java
+++ b/src/main/java/ru/bclib/api/surface/rules/SurfaceNoiseCondition.java
@@ -1,4 +1,4 @@
-package ru.bclib.api.biomes;
+package ru.bclib.api.surface.rules;
 
 import com.mojang.serialization.Codec;
 import net.minecraft.world.level.levelgen.SurfaceRules;
@@ -8,7 +8,6 @@ import net.minecraft.world.level.levelgen.SurfaceRules.Context;
 import net.minecraft.world.level.levelgen.SurfaceRules.LazyXZCondition;
 import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
 
-
 public abstract class SurfaceNoiseCondition implements SurfaceRules.ConditionSource{
 	@Override
 	public Codec<? extends ConditionSource> codec() {
diff --git a/src/main/java/ru/bclib/api/surface/rules/SwitchRuleSource.java b/src/main/java/ru/bclib/api/surface/rules/SwitchRuleSource.java
new file mode 100644
index 00000000..3feaca12
--- /dev/null
+++ b/src/main/java/ru/bclib/api/surface/rules/SwitchRuleSource.java
@@ -0,0 +1,35 @@
+package ru.bclib.api.surface.rules;
+
+import com.mojang.serialization.Codec;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.levelgen.SurfaceRules.Context;
+import net.minecraft.world.level.levelgen.SurfaceRules.RuleSource;
+import net.minecraft.world.level.levelgen.SurfaceRules.SurfaceRule;
+import org.jetbrains.annotations.Nullable;
+import ru.bclib.interfaces.NumericProvider;
+import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
+
+import java.util.List;
+
+public record SwitchRuleSource(NumericProvider selector, List<RuleSource> collection) implements RuleSource {
+	@Override
+	public Codec<? extends RuleSource> codec() {
+		return RuleSource.CODEC;
+	}
+	
+	@Override
+	public SurfaceRule apply(Context context) {
+		
+		return new SurfaceRule() {
+			@Nullable
+			@Override
+			public BlockState tryApply(int x, int y, int z) {
+				final SurfaceRulesContextAccessor ctx = SurfaceRulesContextAccessor.class.cast(context);
+				int nr = Math.max(0, selector.getNumber(ctx)) % collection.size();
+				
+				return collection.get(nr).apply(context).tryApply(x, y, z);
+			}
+		};
+		
+	}
+}
diff --git a/src/main/java/ru/bclib/interfaces/NumericProvider.java b/src/main/java/ru/bclib/interfaces/NumericProvider.java
new file mode 100644
index 00000000..6d647f81
--- /dev/null
+++ b/src/main/java/ru/bclib/interfaces/NumericProvider.java
@@ -0,0 +1,7 @@
+package ru.bclib.interfaces;
+
+import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
+
+public interface NumericProvider {
+	int getNumber(SurfaceRulesContextAccessor context);
+}
diff --git a/src/main/java/ru/bclib/mixin/common/SurfaceRulesContextAccessor.java b/src/main/java/ru/bclib/mixin/common/SurfaceRulesContextAccessor.java
index 021d23bd..99b653a5 100644
--- a/src/main/java/ru/bclib/mixin/common/SurfaceRulesContextAccessor.java
+++ b/src/main/java/ru/bclib/mixin/common/SurfaceRulesContextAccessor.java
@@ -35,4 +35,10 @@ public interface SurfaceRulesContextAccessor {
 
     @Accessor("noiseChunk")
     NoiseChunk getNoiseChunk();
+    
+    @Accessor("stoneDepthAbove")
+    int getStoneDepthAbove();
+    
+    @Accessor("stoneDepthBelow")
+    int getStoneDepthBelow();
 }
diff --git a/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java b/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java
index e6f01c13..e7405c35 100644
--- a/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java
+++ b/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java
@@ -1,6 +1,6 @@
 package ru.bclib.world.surface;
 
-import ru.bclib.api.biomes.SurfaceNoiseCondition;
+import ru.bclib.api.surface.rules.SurfaceNoiseCondition;
 import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
 import ru.bclib.noise.OpenSimplexNoise;
 import ru.bclib.util.MHelper;
diff --git a/src/main/resources/bclib.accesswidener b/src/main/resources/bclib.accesswidener
index 26921210..851b44f6 100644
--- a/src/main/resources/bclib.accesswidener
+++ b/src/main/resources/bclib.accesswidener
@@ -4,6 +4,7 @@ accessWidener   v1  named
 accessible    class    net/minecraft/client/Minecraft$ExperimentalDialogType
 accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$Context
 accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$Condition
+accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$SurfaceRule
 accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$LazyXZCondition
 accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$LazyCondition
 accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$SequenceRuleSource
\ No newline at end of file