diff --git a/rocks/ign.lua b/rocks/ign.lua
index fbbea4c..c95dda8 100644
--- a/rocks/ign.lua
+++ b/rocks/ign.lua
@@ -37,7 +37,7 @@ minetest.register_node( "rocks:gabbro", {
 local reg=function(name,param)
  minetest.register_ore({
    ore    = name,
-   wherein= { "mapgen_stone", "default:stone", "rocks:basalt" },
+   wherein= param.inr,
    ore_type       = "scatter",
    clust_scarcity = 10^3,
    clust_num_ores = 20^3,
@@ -54,10 +54,10 @@ local reg=function(name,param)
 end
 rocks.register_igneous_stratus=reg
 
--- rock registration
- reg("rocks:granite", { spread=40, height=32, treshold=0.08})
- reg("rocks:diorite", { spread=40, height=32, treshold=0.24})
- reg("rocks:gabbro",  { spread=40, height=32, treshold=0.36})
+-- continental (granite): diorite and gabbro
+-- oceanic (basalt): gabbro
+ reg( "rocks:gabbro",  {spread=60, height=40, treshold=0.34, inr={"rocks:granite","rocks:basalt"} })
+ reg( "rocks:diorite", {spread=60, height=40, treshold=0.24, inr={"rocks:granite"} })
 
 -- vein stuff
 
diff --git a/rocks/sed.lua b/rocks/sed.lua
index bfab5a7..71c0a57 100644
--- a/rocks/sed.lua
+++ b/rocks/sed.lua
@@ -90,22 +90,25 @@ do
   if btype=="lowland" then
    def.node_filler="rocks:mudstone"
    def.depth_filler=11
+   def.node_stone="rocks:granite"
   elseif btype=="highland" then
    def.node_filler="rocks:limestone"
    def.node_stone="rocks:limestone"
    def.depth_filler=15
   elseif btype=="beach" then
+   def.node_stone="rocks:granite"
+   def.y_min=beach_min
    if def.heat_point<50 then
     def.node_top="default:gravel"
     def.node_filler="default:gravel"
     def.depth_filler=2
-    def.y_min=beach_min
    elseif def.humidity_point>70 then
     def.node_filler="rocks:laterite"
     def.depth_top=0
    end
+  elseif btype=="ocean" then
+   def.node_stone="rocks:basalt"
   end
-  if (def.node_stone=="default:stone") or (not def.node_stone) then def.node_stone="rocks:basalt" end
   do -- deactivate the added and removed shore-thing of MGv7
    -- to fix weirid sand layers underground
    def.node_shore_top=def.node_top