Latest Images

?Cyrtodontula compressa

Thu, 04 Nov 2021 16:57:27 +0000

Darken image and no paints to enhance the natural appearances.

?Cyrtodontula compressa

Thu, 04 Nov 2021 16:57:25 +0000

Whitella is an invalid genus name - all specimens once called Whitella is in Cyrtodontula. Found in Decorah shale - the largest uncommon bivalve I have ever found in Decorah Shale as of 2021. There could be others since all bivalves are listed as uncommon to rare in Decorah shale. It could be my bias but oddly enough I only find mold impressions of this one (all 3 individuals) as negative molds in limestone without any hard shale encrust in the hollows. Trying Paint to show outlines - strongly resembles modern Anadara notabilis in general shape for example - its NOT related to Anadara. I'm only picking the name Cyrtodontula compressa for now since its the only one that at least for me closely resembles the fossils in shape and sizes. Forgot to add ruler so measurements roughly from where estimated hinge line to farther part of the mold is 50 mm for the two smaller individuals and 60 mm for the larger individuals.

100_8978

Sun, 21 Feb 2021 19:06:35 +0000

Ctenodonta longa - rare Decorah Twin Cities. Tiny actually.

100_8977

Sun, 21 Feb 2021 19:06:34 +0000

Ctenodonta species. Localized common in very fine light shell hash. Hard to make out other details.

100_8979

Sun, 21 Feb 2021 19:06:33 +0000

Ctenodonta hamburgensis Decorah Formation. Rare. This one is unusual in most of shell is perserved, only a chuck missed from right side.

100_8980

Sun, 21 Feb 2021 19:06:32 +0000

Vanuxemia sardesoni Platteville only that I know of. Much more flatter and wider than other Vanuxemia species. Uncommon.

100_8981

Sun, 21 Feb 2021 19:06:31 +0000

Vanuxemia obstusifrons Common in Decorah formation, uncommon in Platteville Formation. Vary considerable in sizes.

100_8974

Sun, 21 Feb 2021 17:47:43 +0000

Overexposure light when taking picture so blue appear to be the best for me so far. Rare Decorah Formation Ordovician Twin Cities Minnesota. Deceptrix planodorsata is what I figures this bivalve is. Kind of reminds me of certain modern nut clam species.

100_8971

Sun, 21 Feb 2021 18:42:10 +0000

Back side of guessing Orthodesma schucherti. Showing perserved part of shell.

100_8970

Sun, 21 Feb 2021 18:43:27 +0000

Guessing Orthodesma schucherti. Rare Decorah twin Cities Minnesota.