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Petrified Dinosaur Dung Coprolite Fossil Poop 11.9oz. For Sale
Location: Cowlitz County, Washington State
Collected by: Spencer Seymour
The enigmatic origin of ferruginous "COPROLITES" are evidence from the Miocene Wilkes Formation, Southwestern Washington.
Geologist "George Mustoe" Western Washington State University.
Excrement-shaped masses of siderite and limonite have been reported from clay-rich sedimentary rocks that range in age from late Permian to Holocene. These objects have been widely accepted as being coprolites, but the ferruginous composition, absence of internal inclusions, and scarcity of associated vertebrate remains suggest that they may instead be pseudofossils created by mechanical deformation of plastic sediment. Possible abiotic mechanisms include coseismic liquefaction, intrusion of sediment inot hollow logs, or expulsion of sediment in response to gravity. Alternatively, carbon stable isotope ratios indicate that sediment extrusion may have been related to emission of biogenic methane during early stages of diagenesis.
DIMENSIONS 3" wide by 5" long at its widest points and 1-1/4 " thick tapering to both ends.