1.5" Amphiplaga brachyptera | Green River Formation | Wyoming Crinoid a chromium-rich variety of muscovite

a chromium-rich variety of muscovite mica

Estimates suggest it grew to between 15 and 18 meters in length

The internal natural pocket area of the clam is replaced with stunning golden yellow calcite crystals that fluoresces and phosphorescence a bright yellow to a light green under short and long wave black (UV) light

Unlike the modern sperm whale which only has functional teeth on the lower jaw

1.5" Amphiplaga brachyptera | Green River Formation | Wyoming Crinoid a chromium-rich variety of muscoviteAmphiplaga brachyptera Eocene (51. 98 Million Years Ago) Private Quarry, Green River Formation, Wyoming, USA Preparation by Jim Tynsky Amphiplaga approx. size: 1. 5" Matrix approx. size: 2. 5" x 2" Apmhiplaga is a member of the Family Percopsidae under the Order Percopsiformes. The family is referred to as trout perch due to a superficial resemblance to trout and perch, but percopsids are not closely related to either group. Percopsiformes are