A very hot day in the West Desert of Utah netted these.
The first (bottom) I have identified as ?Koninckites on the web site, dont know if that ID is anywhere close. Compressed shells with a well rounded venter, the umbillicus is shallow, the umbillical walls almost non-existant, especially on older shells. The only ornamentation is well formed growth lines, not strong enough to be called ribs, but stronger than most growth lines.
The second (top) is tentatively identified as Wyomingites, again, no constrictions as in Xenoceltites, and no ribs as in Kashmirites.
Someday some brite young phD. will revise the taxonomy of the Early Triassic ammonoids and put a smile on my face.