Tirolites ?

? Tirolites body chamber cast

From above the "Clam Wall" and below the "Spathian Gap", geographic outcrop nicknames that don't mean anything to anyone unless you have a copy of my field notes from 15 years ago, sorry. Even below M109 of anothers' notes. Not a very good fossil, but it may be important.

Calcite Heteromorph

A small portion of a heteromorph ammonoid, possibly Allocrioceras. This thing is only about 1.5mm long, photo taken through the eyepiece of my microscope. Dorsal side toward viewer, without impressed zone so it was completely evolute and probably open whorled, not enough preserved to tell if it was helical or not. From the Upper Cretaceous Mancos Shale, lower Upper Turonian Scaphites whitfieldi Zone.

Rudolftruempyiceras Guex & Bylund 2010

The name Boreoceras Dagys & Ermakova (1988), has been replaced with Rudolftruempyiceras Guex & Bylund 2010, Family Columbitidae, see Guex, J., Hungerbuhler, A., Jenks, J., O’Dogherty, L., Atudorei, V., Taylor, D., Bucher, H., Bartolini, A., 2010, Spathian (Lower Triassic) Ammonoids from Western USA (Idaho, California, Utah and Nevada), Memoire de Geologie (Lausanne), No. 49, on page 29. The name Boreoceras is used for an Ordovician Endocerid Nautiloid by Miller & Youngquist (1947). The ammonoids in this old post and this update, will probably be referred to Xenoceltites and not the new genus.

Link

Cephalopods - Present and Past

Cephalopods - Present and Past:



Stephen, D.A., Bylund, K.G., Bybee, P.J. and Ream, W.J.: Ammonoid beds in the Lower Triassic Thaynes Formation of western Utah, USA, p. 243-252

In the 20 years since I located the Triassic fossil bearing beds in the Confusion Range of western Utah, I have only co-authored papers on sponges and gastropods. Now, a paper on the Ammonoids. The first of many I hope.

Calcite Replacement

Calcite replaced ammonoid shell
(is that really angular coiling in the umbilicus?)

another showing partial suture line

Early Triassic Lilliputians

Lilliputians

Just for comparison, the typical size of previously studied Early Triassic gastropods with a Dime for scale.

Early Triassic Gullivers

Gullivers from a Lilliputian world
Article abstract

I have been walking on them for almost 20 years, so I knew they were there, I new they were big, and I knew their age, I didn't realize the whole story. I had tunnel vision, only seeing the ammonoids and occasionally looking at the Lilliputians in the overlying beds. The last few years have been different, looking at the other fossils a little closer, they all have a story to tell.
Its OK to have a favorite, or specialize in a certain taxon, but also take a good look at everything else, it's all very informative.

Placenticeras syrtale

Placenticeras syrtale prepared and ready for display

It may end up in the John Wesley Powell River History Museum in Green River, Utah