1. 
   seat-earth
   (from the article `cyclothem`) ...coal-bearing sequences not only show a repetition of coal seams, through sometimes hundreds of metres, but also other rocks in a more or less ...
   Found op http://www.britannica.com/eb/a-z/s/53
   
   
2. 
   Seatearth
   Seatearth is a British coal mining term, which is used in the geological literature. As noted by Jackson, a seatearth is the layer of sedimentary rock underlying a coal seam. Seatearths have also been called seat earth, "seat rock", or "seat stone" in the geologic literature. Depending on its physi...
   Found op http://en.wikipedia.org/wiki/Seatearth
   
   

Tip: double click on a word to show its meaning.