That tectonic action boosts temperatures in the layers of mudstone and volcanic ash that fill in the trough. (sciencemag.org)
The thick mudstone layer known as the Morrison Formation was deposited on top of the Sundance Sea as it disappeared in the late Jurassic. (wyodino.org)
A step forward that non-specialists neither know nor care about (eg New fossil forces radical rethink in mudstone geology) (newscientist.com)