North America, Western United States, Wyoming, Green River Formation, Eocene, ca. 40 million years ago. This is a remarkably well preserved fossilized Priscacara fish encased in a stone matrix from the "18 inch" layer of the Green River Formation. Priscacara or nicknamed "Prisky" is known for its sunfish-like body with prominent dorsal and anal spines that are on full display in this specimen! The body of the fish is excavated and slightly recessed in the surface, the matrix layers once covering the fossil are cut away to reveal not only the bones but the remains of the soft tissue! The deep umber brown of this fossilized fish contrasts nicely against the beige sandstone matrix, and this stone is mounted on a wood panel for future display hardware. Size of fish: 10" L x 5" W (25.4 cm x 12.7 cm) matrix: 13.125" L x 1.125" W x 7.5" H (33.3 cm x 2.9 cm x 19 cm)
The Eocene stage was the warmest of the Cenozoic (our current era), with an average mean temperature around 86 F (30 C); for comparison, the average mean temperature in the last seventy years is around 58 F (14 C). Although the map of the Earth's surface would have been very recognizable to us today, with most of the continents in place and India moving close to its current position, there were almost no ice caps and huge swaths of the landscape were covered with water. During the Cretaceous period and into the early Paleocene - just before the Eocene, a vast inland sea covered the center of North America, known as the Western Interior Seaway. This ancient world was ruled by fish and aquatic plants, like those preserved in this slab.
Provenance: private Berthoud, Colorado, USA collection
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#171632
Condition
Professionally prepared and excavated. Repaired, stable fissure radiating from lower edge of matrix and across fish fossil, nearly indiscernible and does not affect presentation. Amazing preservation to details. Matrix is mounted on a wood board for display and reinforcement.