diff --git a/geologica.lua b/geologica.lua
index d627623..2a14e52 100644
--- a/geologica.lua
+++ b/geologica.lua
@@ -72,7 +72,7 @@ minetest.register_node( "rocks:mudstone", {
 	groups = {cracky=CcSoft, stone=1}, 
 	is_ground_content = true, sounds = default.node_sound_stone_defaults(),
 })
-rocks.register_layer( "mudstone",{ gain=10, height=-13, limit=2, seed=4 }, "rocks:mudstone")
+rocks.register_layer( "mudstone",{ gain=10, height=-13, limit=2, seed=4 }, "air")
 
 -- Slate        MM/barro   med   Under mud/clay/siltstone
 minetest.register_node( "rocks:slate", {  
diff --git a/geologica_nv.lua b/geologica_nv.lua
index f037b00..6d456f5 100644
--- a/geologica_nv.lua
+++ b/geologica_nv.lua
@@ -8,6 +8,15 @@ local CcSoft=3
 --
 
 -- Claystone    Sed        soft  in mudstone
+rocks.register_vein("clay",{
+        spread = {x=10, y=10, z=10},
+        treshold=0.75,
+        seed = 9,
+        hmin=-8, hmax=nil,
+        layers={ "mudstone" },
+})
+rocks.register_ore( "clay", "default:clay", {treshold=0, chance=0.8 } )
+
 -- Breccia      Mixture    soft  in mudstone
 -- Conglomerate Sed        soft  in mudstone
 -- Skarn        MM/contact med   in mudstone in mountains
diff --git a/init.lua b/init.lua
index 1e7938e..4090d35 100644
--- a/init.lua
+++ b/init.lua
@@ -21,6 +21,7 @@ rocks.noiseparams_layers = {
 
 dofile(modpath.."/mapgen.lua")
 dofile(modpath.."/geologica.lua")
+dofile(modpath.."/geologica_nv.lua")
 
 
 print("[rocks] loaded.")
diff --git a/mapgen.lua b/mapgen.lua
index 5131ac5..314e2d0 100644
--- a/mapgen.lua
+++ b/mapgen.lua
@@ -53,6 +53,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
  local availlayers=mknoises(rocks.layers,minp,maxp,seed)
  local perlin_index = 1
  --
+ print("[rocks] afterinit "..os.clock()-timebefore)
  for x=minp.x,maxp.x,1 do
   for z=minp.z,maxp.z,1 do
    --* initialize layers hmap