sedimentary

Fossiliferous Sandstone with Plant Remains

Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Buff, tan, and dark brown; Luster: Dull/Earthy; Crystal Structure: Clastic; Cleavage: None; Specific Gravity: 2.3-2.6

Hardness: 6-7 (individual grains)
Color: Buff, tan, and dark brown
Luster: Dull/Earthy

Identified July 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: Buff, tan, and dark brown; Luster: Dull/Earthy; Crystal Structure: Clastic; Cleavage: None; Specific Gravity: 2.3-2.6

Formation & geological history

Formed through the accumulation and litification of sand-sized grains in a fluvial or deltaic environment. The coordinate 17.3S, 66.2W corresponds to the Cochabamba region of Bolivia, known for its extensive Devonian and Carboniferous sedimentary sequences containing terrestrial plant fossils.

Uses & applications

Scientific study, educational collections, and local building material in some regions.

Geological facts

The dark brown, flattened textures on the surface represent carbonized remains or molds of ancient plant matter, such as stems or bark, preserved during the rapid burial of sediments in an ancient basin.

Field identification & locations

Identify by its gritty texture and visible layers. Look for plant-like patterns or dark organic stains on bedding planes. These are common in the Altiplano and Andean valley regions of Bolivia.