$UNGS Devonian shales are formed from the mud of s
Post# of 144492
Posted On: 11/08/2013 9:20:43 AM
$UNGS Devonian shales are formed from the mud of shallow seas that existed about 350 million years ago (during the Devonian period of the Paleozoic era). Shale is a very fine-grained sedimentary rock, which is easily breakable into thin, parallel layers.
(0)
(0)Scroll down for more posts ▼