diff --git a/init.lua b/init.lua
index 962577f..e0e7b74 100644
--- a/init.lua
+++ b/init.lua
@@ -13,15 +13,20 @@ rocks={}
 rocksl={}
 
 rocksl.print=function(text)
- print("[rocks] "..text)
+ minetest.log("info","/rocks "..text)
+end
+
+rocksl.seedseq=0
+rocksl.GetNextSeed=function()
+ rocksl.seedseq=rocksl.seedseq+20
+ return rocksl.seedseq
 end
 
 local modpath=minetest.get_modpath(minetest.get_current_modname())
 
-dofile(modpath.."/mapgen.lua")
 dofile(modpath.."/sed.lua")
-dofile(modpath.."/ign.lua")
-dofile(modpath.."/skarn.lua")
+--dofile(modpath.."/ign.lua")
+--dofile(modpath.."/skarn.lua")
 
 minetest.register_on_mapgen_init(function(mapgen_params)
  -- todo: disable caves and ores
diff --git a/mapgen.lua b/mapgen.lua
deleted file mode 100644
index 5fb5473..0000000
--- a/mapgen.lua
+++ /dev/null
@@ -1,230 +0,0 @@
---
--- layer generator
---
-
-local print2=function(text)
- minetest.log("info","rocks/gen/ "..text)
-end
-
-rocksl.seedseq=0
-rocksl.GetNextSeed=function()
- rocksl.seedseq=rocksl.seedseq+20
- print2("seed "..rocksl.seedseq)
- return rocksl.seedseq
-end
-
-local layers={}
-
-rocks.layer_initialize=function(layer)
- layer.stats={ count=0, total=0, node={}, totalnodes=0 }
- table.insert(layers,layer)
-end
-
-rocksl.register_stratus=function(layer,name,param)
- table.insert(layer.localized,{
-  primary=name,
-  spread=(param.spread or 20),
-  height=(param.height or 15),
-  treshold=(param.treshold or 0.85),
-  secondary=param.secondary,
-  seed=(rocksl.GetNextSeed()),
- })
- layer.stats.node[name]=0
-end
-
-local veins={}
-
-rocks.register_vein=function(name,param)
- local d={
-   primary=name,
-   wherein=param.wherein,
-   miny=param.miny, maxy=param.maxy,
-   radius={ average=param.radius.average, amplitude=param.radius.amplitude, frequency=param.radius.frequency },
-   density=(param.density or 1),
-   rarity=param.rarity,
-   secondary=(param.ores or {}),
-  }
- table.insert(veins,d)
-end
-
--- TODO: rewrite above function to register normal minetest ore, with
--- special params, so the below func is not necesary. The mt oregen runs in 
--- separate therad (emerge) and it does not block server.
--- params: type=scatter scacrity=1 size=3 ores=27 : full chance of spawning, only limited by noise thr
--- EDIT: Need to edit mg_ore.cpp and Add following ore_types: layer, blob, region.
-   -- layer=2Dheightmap style layer with specific thickness
-   -- blob= 3D noise deformed sphere
-   -- region= 3D noise / treshold ore placement.
-
-rocksl.layergen=function(layer, minp, maxp, seed)
- if   ( (layer.top.offset+layer.top.scale)>minp.y )
-  and ( (layer.bot.offset-layer.bot.scale)<maxp.y )
- then
-  local stone_ctx= minetest.get_content_id("default:stone")
-  local air_ctx= minetest.get_content_id("air")
-  local dirt_ctx= minetest.get_content_id("default:dirt")
-  if layer.debugging then 
-   layer.primary.ctx= air_ctx
-  else
-   layer.primary.ctx= minetest.get_content_id(layer.primary.name)
-  end
-  local timebefore=os.clock();
-  local manipulator, emin, emax = minetest.get_mapgen_object("voxelmanip")
-  local nodes = manipulator:get_data()
-  local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
-  local side_length = (maxp.x - minp.x) + 1
-  local map_lengths_xyz = {x=side_length, y=side_length, z=side_length}
-  -- noises:
-  local bottom=minetest.get_perlin_map(layer.bot,map_lengths_xyz):get2dMap_flat({x=minp.x, y=minp.z})
-  local localized={}
-  for _,loc in ipairs(layer.localized) do
-   --defaults and overrides
-   local np={ offset = 0, scale = 1, octaves = 1, persist = 0.7,
-    spread = {x=loc.spread, y=loc.height, z=loc.spread}, seed=loc.seed}
-   --get noise and content ids
-   table.insert(localized,
-   {
-    noise=minetest.get_perlin_map(np,map_lengths_xyz):get3dMap_flat(minp),
-    treshold=loc.treshold,
-    ctx= minetest.get_content_id(loc.primary),
-    ndn=loc.primary
-   })
-  end
-  local noise2d_ix = 1
-  local noise3d_ix = 1
-  print2("after noise: "..(os.clock()-timebefore))
-  for z=minp.z,maxp.z,1 do
-   for y=minp.y,maxp.y,1 do
-    for x=minp.x,maxp.x,1 do
-     local pos = area:index(x, y, z)
-     if  (y>bottom[noise2d_ix]) and (y<layer.top.offset)
-     and ( (nodes[pos]==stone_ctx) or (nodes[pos]==dirt_ctx) )
-     then
-      layer.stats.totalnodes=layer.stats.totalnodes+1
-      if nodes[pos]==stone_ctx then nodes[pos] = layer.primary.ctx end
-      for k,loc in pairs(localized) do
-       if ( loc.noise[noise3d_ix] > loc.treshold) then
-        nodes[pos]=loc.ctx
-        layer.stats.node[loc.ndn]=layer.stats.node[loc.ndn]+1
-        break
-       end
-      end
-     end
-     noise2d_ix=noise2d_ix+1
-     noise3d_ix=noise3d_ix+1
-    end
-    noise2d_ix=noise2d_ix-side_length
-   end
-   noise2d_ix=noise2d_ix+side_length
-  end
-  print2("after loop: "..(os.clock()-timebefore))
-  manipulator:set_data(nodes)
-  --manipulator:calc_lighting()
-  --manipulator:update_liquids()
-  if layer.debugging then 
-   manipulator:set_lighting({day=15,night=15})
-  end
-  manipulator:write_to_map()
-  print2("after commit: "..(os.clock()-timebefore))
-  layer.stats.count=layer.stats.count+1
-  layer.stats.total=layer.stats.total+(os.clock()-timebefore)
-  layer.stats.side=side_length
- end
-end
-
-local ignore_wherein=nil
-
-rocksl.veingen=function(veins,minp,maxp,seed)
- local side_length=(maxp.y-minp.y)
- local random=PseudoRandom(seed-79)
- local timebefore=os.clock();
- local manipulator, emin, emax = minetest.get_mapgen_object("voxelmanip")
- local nodes = manipulator:get_data()
- local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
- local did_generate=nil
- for _,vein in ipairs(veins) do
-  if (minp.y<vein.maxy) and (maxp.y>vein.maxy) then
-   local vr2=vein.radius.average^2
-   local vrm=vein.radius.average+vein.radius.amplitude
-   local noise_map=minetest.get_perlin_map(
-    {
-     seed=-79,
-     scale=vein.radius.amplitude,
-     offset=0, octaves=1, persist=0.7,
-     spread={x=vein.radius.frequency, y=vein.radius.frequency, z=vein.radius.frequency}
-    },{x=(vrm*2)+1, y=(vrm*2)+1, z=(vrm*2)+1}
-   )
-   local iterations_count= (vein.rarity*side_length)^3
-   -- Resolve node names to id's
-   iterations_count=iterations_count+(random:next(0,100)/100)
-   local primary_ctx=minetest.get_content_id(vein.primary)
-   for _,sec in pairs(vein.secondary) do sec.ctx=minetest.get_content_id(sec.ore) end
-   --old:local wherein_ctx=minetest.get_content_id(vein.wherein)
-   local wherein_set={}
-   for _,wi in pairs(vein.wherein) do wherein_set[minetest.get_content_id(wi)]=true end
-   --print("vein "..vein.primary.." ic="..iterations_count.." p="..primary_ctx)
-   for iteration=1, iterations_count do
-    local x0=minp.x+ random:next(0,side_length)
-    local y0=minp.y+ random:next(0,side_length)
-    local z0=minp.z+ random:next(0,side_length)
-    local noise=noise_map:get3dMap_flat({x=x0-vrm, y=y0-vrm, z=z0-vrm})
-    local noise_ix=1
-    local posi = area:index(x0, y0, z0)
-    if ignore_wherein or wherein_set[nodes[posi]] then
-     print("vein "..vein.primary.." @ "..x0..","..y0..","..z0.." vrm="..vrm)
-     did_generate=1
-     for x=-vrm, vrm do
-      for y=-vrm, vrm do
-       for z=-vrm, vrm do
-        local posc = {x=x+x0,y=y+y0,z=z+z0}
-        posi = area:index(posc.x, posc.y, posc.z)
-        local nv=noise[noise_ix]
-        if (ignore_wherein or wherein_set[nodes[posi]]) and (((x^2)+(y^2)+(z^2))<((vein.radius.average+nv)^2)) then
-         nodes[posi]=primary_ctx
-         local luck=random:next(0,99)
-         for _,sec in pairs(vein.secondary) do
-          luck=luck-sec.percent
-          if luck<=0 then 
-           nodes[posi]=sec.ctx
-           break
-          end
-         end
-        end
-        noise_ix=noise_ix+1
-     end end end
-    else
-     --print("vein "..vein.primary.." bad environmnent -"..minetest.get_node({x0,y0,z0}).name.."="..nodes[posi])
-    end
-   end
-  end
- end
- if did_generate then
-  manipulator:set_data(nodes)
-  --manipulator:calc_lighting()
-  manipulator:write_to_map()
-  print("end veingen "..(os.clock()-timebefore))
- else
-  --print("end veingen (nothin generated)")
- end
-end
-
-minetest.register_on_generated(function(minp, maxp, seed)
- for _,layer in pairs(layers) do rocksl.layergen(layer,minp,maxp,seed) end
- rocksl.veingen(veins,minp,maxp,seed)
-end)
-
-minetest.register_on_shutdown(function()
- for _,ign in pairs(layers) do
-  print("[rocks] Stats for layer "..ign.name)
-  if (ign.stats.count==0) then
-   print("[rocks] |- stats not available, no chunks generated")
-  else
-   print("[rocks] |- generated total "..ign.stats.count.." chunks in "..ign.stats.total.." seconds ("..(ign.stats.total/ign.stats.count).." seconds per "..ign.stats.side.."^3 chunk)")
-   for name,total in pairs(ign.stats.node) do
-    print("[rocks] |-  "..name..": "..total.." nodes placed ("..(total*100)/(ign.stats.totalnodes).." %)")
-   end
-  end
- end
-end)
-
--- ~ Tomas Brod
\ No newline at end of file
diff --git a/sed.lua b/sed.lua
index d65a6af..b20bc87 100644
--- a/sed.lua
+++ b/sed.lua
@@ -2,24 +2,6 @@
 -- Sedimentary Layer
 --
 
-local sed={
- name="sed",
- top={
-  offset = 20, scale = 0,
-  spread = {x=80, y=80, z=80},
-  octaves = 0, persist = 0 },
- bot={
-  offset = -16, scale = 10, seed=rocksl.GetNextSeed(),
-  spread = {x=80, y=80, z=80},
-  octaves = 2, persist = 0.7 },
- primary={ name="rocks:mudstone" },
- localized={},
- stats={ count=0, total=0, node={}, totalnodes=0 },
- debugging=nil
-}
-
-rocks.layer_initialize(sed)
-
 -- Mudstone     Sed        soft  Ocean, beach, river, glaciers
 minetest.register_node( "rocks:mudstone", {  
 	description = S("Mudstone"),
@@ -28,6 +10,26 @@ minetest.register_node( "rocks:mudstone", {
 	is_ground_content = true, sounds = default.node_sound_dirt_defaults(),
 })
 
+do -- Modify default grassland biome
+ local grassland=minetest.registered_biomes["default:grassland"] or
+  {
+   name = "rocks:grassland",
+   node_top = "default:dirt_with_grass",
+   depth_top = 1,
+   y_min = 5,
+   y_max = 31000,
+   heat_point = 50,
+   humidity_point = 50,
+  }
+ grassland.node_filler="rocks:mudstone"
+ grassland.depth_filler=11
+ minetest.clear_registered_biomes()
+ minetest.register_biome(grassland)
+end
+
+-- more biomes
+
+
 -- more rock defs
 minetest.register_node( "rocks:limestone", {  
 	description = S("Limestone"),
@@ -38,7 +40,24 @@ minetest.register_node( "rocks:limestone", {
 
 
 local reg=function(name,param)
- rocksl.register_stratus(sed,name,param)
+ minetest.register_ore({
+  ore=name,
+  wherein= { 
+         "rocks:mudstone",
+         },
+  ore_type         = "scatter",
+  clust_scarcity   = 1,
+  clust_size       = 3,
+  clust_num_ores   = 27,
+  y_min            = -20,
+  y_max            = 40,
+  noise_threshhold = param.treshold,
+  noise_params     = {
+          offset=0, scale=1, octaves=3, persist=0.3,
+          spread={x=param.spread, y=param.height, z=param.spread},
+          seed=rocksl.GetNextSeed(),
+                     },
+ })
 end
 
 rocks.register_sedimentary=reg
@@ -50,10 +69,10 @@ rocks.register_sedimentary=reg
 --Conglomerate Weak   Localized continental, folded
 -->Limestone    Medium Localized continental, folded; primary oceanic, hills
 -->Coal         -      Large beds, twice as common in swamps
- reg("rocks:limestone",    { spread=64, height=32, treshold=0.35 })
+ --reg("rocks:limestone",    { spread=64, height=32, treshold=0.35 })
  --reg("rocks:breccia",  { spread=64, height=32, treshold=0.6 })
  --reg("rocks:conglomerate", { spread=64, height=32, treshold=0.6 })
- reg("default:stone_with_coal", { spread=48, height=14, treshold=0.50 })
- reg("default:clay",{ spread=48, height=14, treshold=0.50 })
+ reg("default:stone_with_coal", { spread=64, height=14, treshold=0.60 })
+ reg("default:clay",{ spread=48, height=14, treshold=0.56 })
 
 -- ~ Tomas Brod
\ No newline at end of file