Many of these rocks are fairly heavy, so they should not be used in the integrated rock units mentioned earlier. (petbusiness.com)
In South America, the two endemic «river dolphin» lineages form a clade (Inioidea), with closely related fossil inioids from marine rock units in the South Pacific and North Atlantic oceans. (peerj.com)
We also got to see some of the amazing rock formations of the Sheep Rock Unit of John Day Fossil beds and go to the visitor center there to see the fossils and watch the video. (thehotflashpacker.com)