Update artifact_gravel.json

Author: Uraneptus

src/generated/resources/data/sullysmod/worldgen/placed_feature/artifact_gravel.json

@@ -1,10 +1,6 @@
 {
   "feature": "sullysmod:artifact_gravel",
   "placement": [
-    {
-      "type": "minecraft:count",
-      "count": 30
-    },
     {
       "type": "minecraft:in_square"
     },
@@ -13,7 +9,7 @@
       "height": {
         "type": "minecraft:uniform",
         "max_inclusive": {
-          "absolute": 50
+          "absolute": 62
         },
         "min_inclusive": {
           "above_bottom": 0
@@ -27,6 +23,22 @@
         "blocks": "minecraft:gravel"
       }
     },
+    {
+      "type": "minecraft:block_predicate_filter",
+      "predicate": {
+        "type": "minecraft:matching_blocks",
+        "blocks": "minecraft:air",
+        "offset": [
+          0,
+          1,
+          0
+        ]
+      }
+    },
+    {
+      "type": "minecraft:count",
+      "count": 40
+    },
     {
       "type": "minecraft:biome"
     }