diff --git a/multi_map_core/init.lua b/multi_map_core/init.lua
index 8d51571..caa3510 100644
--- a/multi_map_core/init.lua
+++ b/multi_map_core/init.lua
@@ -33,18 +33,39 @@ function multi_map.get_offset_y(y)
 	return y - center_point
 end
 
-function multi_map.register_fallback_generator(generator)
-	multi_map.fallback_generator = generator
+function multi_map.register_fallback_generator(...)
+	local arg = {...}
+	local generator
+	local arguments
+
+	if arg[2] then
+		generator = arg[1]
+		arguments = arg[2]
+	else
+		generator = arg[1]
+	end
+	multi_map.fallback_generator = { generator = generator, arguments = arguments }
 end
 
 function multi_map.register_generator(...)
 	local arg = {...}
 	local position
 	local generator
+	local arguments
 
-	if arg[2] then
+	if arg[3] then
 		position = arg[1]
 		generator = arg[2]
+		arguments = arg[3]
+		print(arguments)
+	elseif arg[2] then
+		if type(arg[1]) == "function" then
+			generator = arg[1]
+			arguments = arg[2]
+		else
+			position = arg[1]
+			generator = arg[2]
+		end
 	else
 		generator = arg[1]
 	end
@@ -56,7 +77,7 @@ function multi_map.register_generator(...)
 				t = {}
 				multi_map.generators[i] = t
 			end
-			table.insert(t, generator)
+			table.insert(t, { generator = generator, arguments = arguments })
 		end
 	else
 		local t = multi_map.generators[position]
@@ -64,7 +85,7 @@ function multi_map.register_generator(...)
 			t = {}
 			multi_map.generators[position] = t
 		end
-		table.insert(t, generator)
+		table.insert(t, { generator = generator, arguments = arguments })
 	end
 end
 
@@ -83,6 +104,7 @@ end
 local firstrun = true
 -- Global helpers for mapgens
 multi_map.c_stone = nil
+multi_map.c_sandstone = nil
 multi_map.c_air = nil
 multi_map.c_water = nil
 multi_map.c_lava = nil
@@ -98,6 +120,7 @@ end)
 minetest.register_on_generated(function(minp, maxp)
 	if firstrun then
 		multi_map.c_stone = minetest.get_content_id("default:stone")
+		multi_map.c_sandstone = minetest.get_content_id("default:sandstone")
 		multi_map.c_air = minetest.get_content_id("air")
 		multi_map.c_water = minetest.get_content_id("default:water_source")
 		multi_map.c_lava = minetest.get_content_id("default:lava_source")
@@ -145,14 +168,14 @@ minetest.register_on_generated(function(minp, maxp)
 		local t = multi_map.generators[multi_map.current_layer]
 		if not t then
 			if multi_map.fallback_generator then
-				multi_map.fallback_generator(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp)
+				multi_map.fallback_generator.generator(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp, multi_map.fallback_generator.arguments)
 			else
 				minetest.log("error", "Generator for layer "..multi_map.current_layer.." missing and no fallback specified, exiting mapgen!")
 				return
 			end
 		else
 			for i,f in ipairs(t) do
-				f(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp)
+				f.generator(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp, f.arguments)
 			end
 		end
 	end
diff --git a/multi_map_generators/init.lua b/multi_map_generators/init.lua
index c16623a..2692c22 100644
--- a/multi_map_generators/init.lua
+++ b/multi_map_generators/init.lua
@@ -6,6 +6,7 @@ dofile(multi_map_generators_path.."/mmgen_simple.lua")
 dofile(multi_map_generators_path.."/mmgen_testauri.lua")
 
 multi_map.register_fallback_generator(mmgen_simple.generate)
+multi_map.register_generator(10, mmgen_simple.generate, "default:sandstone")
 multi_map.register_generator(11, mmgen_testauri.generate)
 multi_map.register_generator(12, mmgen_testauri.generate)
 multi_map.register_generator(13, mmgen_testauri.generate)
diff --git a/multi_map_generators/mmgen_simple.lua b/multi_map_generators/mmgen_simple.lua
index 47abd90..54ab9d2 100644
--- a/multi_map_generators/mmgen_simple.lua
+++ b/multi_map_generators/mmgen_simple.lua
@@ -1,15 +1,24 @@
 mmgen_simple = {}
 
-function mmgen_simple.generate(current_layer, minp, maxp, offset_minp, offset_maxp)
+function mmgen_simple.generate(current_layer, minp, maxp, offset_minp, offset_maxp, content_id)
 	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
 	local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
 	local vm_data = vm:get_data()
+
+	local c_ground
+	if content_id then
+		c_ground = minetest.get_content_id(content_id)
+	else
+		c_ground = multi_map.c_stone
+	end
+
 	if offset_minp.y >= 0 then
 		multi_map.generate_singlenode_chunk(minp, maxp, area, vm_data, multi_map.c_air)
 		vm:set_lighting({day=15, night=0})
 	else
-		multi_map.generate_singlenode_chunk(minp, maxp, area, vm_data, multi_map.c_stone)
+		multi_map.generate_singlenode_chunk(minp, maxp, area, vm_data, c_ground)
 	end
+
 	vm:set_data(vm_data)
 	vm:calc_lighting(false)
 	vm:write_to_map(false)