sedimentary
Sandstone with Trace Fossils
Quartz Arenite with Bioturbation (Trace Fossils)
Hardness: 6-7 on Mohs scale (due to quartz grains); Color: Reddish-brown, tan, or buff due to iron oxide staining; Luster: Dull to earthy; Crystal structure: Clastic (composed of cemented mineral particles or rock fragments rather than individual crystals); Specific gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale (due to quartz grains)
- Color
- Reddish-brown, tan, or buff due to iron oxide staining
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz grains); Color: Reddish-brown, tan, or buff due to iron oxide staining; Luster: Dull to earthy; Crystal structure: Clastic (composed of cemented mineral particles or rock fragments rather than individual crystals); Specific gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz sand, deposited in environments such as deserts, rivers, beaches, or shallow marine settings. Often exhibits trace fossils like burrow tracks from ancient organisms in shallow marine or intertidal zones.
Uses & applications
Used primarily as a building and paving material in construction, dimension stone, landscaping, and collected by paleontologists and geology enthusiasts for trace fossil study.
Geological facts
Trace fossils, or ichnofossils, do not preserve the body of the animal itself, but rather its behavior, such as tracks, trails, burrows, and borings left behind in soft sediment before it lithified into rock.
Field identification & locations
Can be identified in the field by its gritty texture (feeling like sandpaper) and visible sand grains, alongside distinct organic burrow traces or worm trails preserved on the bedding planes. Common in regions with ancient deserts or shallow seas, such as the American Southwest.
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