minetest.register_biome({
   name = "Mud Biome",
   node_top = 'mud:mud',
   depth_top = 3,
   node_filler = 'default:dirt', 
   depth_filler = 4,
   node_stone = 'default:stone',
   y_max = 1300,
   y_min = -1300,
   vertical_blend = 10,
   heat_point = 20,
   humidity_point = 70,
})

minetest.register_ore({
		ore_type        = "blob",
		ore             = "mud:mud",
		wherein         = {"default:sand"},
		clust_scarcity  = 16 * 16 * 16,
		clust_size      = 5,
		y_max           = 0,
		y_min           = -15,
		noise_threshold = 0.0,
		noise_params    = {
			offset = 0.5,
			scale = 0.2,
			spread = {x = 5, y = 5, z = 5},
			seed = -316,
			octaves = 1,
			persist = 0.0
		},
	})