sedimentary
Fossiliferous Sandstone with Plant Remains
Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)
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
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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.
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