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You and I had a fight recently.

Peter Rabbit Sledging

by Beatrix Potter (1894)

Ammonites on Matrix (Quenstedtoceras sp., Jurassic) - Volga River, Ulyanovsk, Russia

This extremely artistic assemblage of large and small ammonites from Russia demonstrate an intense iridescence and highlights due to the presence of metallic Pyrite. The cluster has been positioned on a new matrix, as the grainy rock in which these Quenstedtoceras cephalopods were collected is not hard nor stable enough to display them permanently. The added component is an attractive piece of what is known as septarian, a mud-like material that grows in nodules. In this instance, yellowish Calcite crystals and gray sediment have formed the rock on which these colorful ammonites reside. The cluster is quite representative of the Volga River material, and that combination results in a dramatic display specimen.

Overall Measurements: 6.30 x 5.51 x 5.71 inches (16.00 x 14.00 x 14.50 cm)

Today’s doodle: Torvosaurus tanneri for some signage at Eccles Dinosaur Park. Happy #FossilFriday!

Glacial Striations and Stromatolites and Geology, oh my!

This photo is a two-fer: two awesome geology features in one! On the surface of this rock you will notice faint lines that stretch from the lower left hand corner of the image to the upper right hand corner. These lines are called glacial striations and they form as a glacier scratches the rock surface as it moves. 

The rock surface that was scratched by the moving glacier represents an entirely different time, waaay before the glaciers, when stromatolites dotted the shoreline of an ancient water body that covered Montana. The circles that you see in the rock are the tops of stromatolites, formed by ancient cyanobacteria. 

A great place to see stromatolites and striations is on the Grinnell Glacier Trail. For your best chance of seeing these features free of snow, try hiking the trail in late July or August. NPS Photo

[Image Description: Lines and circles etched into a rock surface.]

Via Peyton Thomas

Heather Nesheim  -  https://www.etsy.com/es/people/heddarsketch  -  https://twitter.com/heddarsketch