Rock Identifier
Fossiliferous Sandstone / Fossil Fragment (Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material) — fossil
fossil

Fossiliferous Sandstone / Fossil Fragment

Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material

Hardness: 5.5-7 (variable depending on matrix silica/calcite content and fossil mineralization). Color: Buff, tan, reddish-brown, and earthy gray tones. Luster: Earthy, dull, non-metallic. Texture: Granular, porous matrix containing visible organic cast or skeletal structural textures.

Hardness
5
Color
Buff, tan, reddish-brown, and earthy gray tones
Luster
Earthy, dull, non-metallic
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Physical properties

Hardness: 5.5-7 (variable depending on matrix silica/calcite content and fossil mineralization). Color: Buff, tan, reddish-brown, and earthy gray tones. Luster: Earthy, dull, non-metallic. Texture: Granular, porous matrix containing visible organic cast or skeletal structural textures.

Formation & geological history

Formed in ancient shallow marine, estuarine, or fluvial environments where organic remains (e.g., bone fragments, shell matrix, or petrified wood) were deposited alongside coarse sand and silt sediments, later cemented by calcite, silica, or iron oxide over millions of years.

Uses & applications

Used primarily for paleontological study, educational collections, display specimens, and as lapidary material or landscape rock.

Geological facts

Sedimentary rocks containing fossils offer direct visual snapshots of ancient paleoenvironments. Iron oxide staining often gives these weathered specimens their characteristic warm red and tan coloration.

Field identification & locations

Look for cellular textures, porous lattice structures, or shell/bone molds embedded within coarse sedimentary grain matrices. Found globally in sedimentary basins, ancient riverbeds, and coastal cliff exposures.

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