Fossil wood (Morrison Formation, Upper Jurassic; Escalante Petrified Forest State Park, Utah, USA) 37

            Fossil wood in the Jurassic of Utah, USA.

This fossil tree trunk is in the Morrison Formation, an Upper Jurassic succession that is widely distributed in many western American states.  The Morrison consists of fluvial (river/floodplain) and lacustrine (lake) deposits, plus reddish-colored paleosol horizons.  Dinosaur bones and dinosaur tracks are moderately common in Morrison Formation sediments.  Exceptionally dinosaur-rich localities include Como Bluff in Wyoming, Dinosaur National Monument in Utah, Dinosaur Ridge in Colorado, and the Cleveland-Lloyd Quarry in Utah.

This type of fossil wood is usually referred to as "petrified wood".  It's a preservation style actually called "permineralization" - the small-scale porosity of buried wood or bone gets filled with minerals as groundwater percolates through.  The most common permineralization mineral is quartz (SiO2).  Cellular-level details can be preserved in permineralized wood, but some examples have little original botanical structure remaining.

Stratigraphy: Brushy Basin Member, Morrison Formation, Upper Jurassic

Locality: trailside, Escalante Petrified Forest State Park, Utah, USA

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Taken on: September 2, 2011

Tags:

fossil

fossils

Escalante

Petrified

Forest

Utah

state

park

permineralized

permineralization

quartz

Morrison

Formation

Jurassic

tree

trees

trunk

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log

logs

Brushy

Basin

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Sets appears in: • Escalante Petrified Forest State Park (southern Utah, USA) • Utah Rocks, Minerals, Fossils more » • Morrison Formation (Upper Jurassic; western USA) • Jurassic Rocks, Minerals, Fossils • Fossil Preservation Styles - Permineralization • Plant Fossils « less

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