“Sequence IV includes strata from the base of the bauxitic claystone below Seam 2 of the Heshan Formation to the top of the Dalong Formation.”
“A number of brown or dark-grey mud-stone and claystone beds have also been reported in the Lang Bay area in British Columbia.”
“All tyrannosaurid and hadrosaur bones lie horizontally within a 20 cm thick blocky, green claystone with occasional calcitic nodules and vertical to subvertical burrows.”