Coal
Bituminous Coal / Anthracite
sedimentary
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Fossilized Coral
Rugosa or Tabulate Coral Fossil (Replacement by Silica/Calcite)
fossil
Fossilized Coral
Rugose coral / Tabulate coral fossil in limestone matrix
fossil
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Fossilized Tiger Shark Tooth
Galeocerdo cuvier (fossilized hydroxylapatite)
sedimentary
Fossil Shell Fragment (possibly Brachiopod or Bivalve)
Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca
sedimentary
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)
Silica (SiO2) and Calcium Fluoride (CaF2) based minerals
mineral
Fossilized Favosites (Honeycomb Coral)
Favosites (extinct genus of tabulate coral)
sedimentary
Trilobite Fossil (Flexicalymene)
Flexicalymene ouzregui
sedimentary
Weathered limestone or calcitic fossil fragment
Calcite-rich carbonate rock; primarily CaCO₃
sedimentary
Weathered limestone or calcareous sandstone
Calcitic carbonate rock, likely limestone (CaCO₃), possibly slightly dolomitic
sedimentary
Sandstone with Brachiopod Mold Fossil
Sedimentary rock (Sandstone) with indeterminate Brachiopod mold
fossil
Turritella Agate (Fossiliferous Chert)
Silicified Elimia tenera (Fossiliferous Chalcedony)
sedimentary
Fossilized Coral / Fossiliferous Limestone
Anthozoa fossil in Limestone (CaCO3)
fossil
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Crinoidea Fossil
fossil
Fossil Assortment and Geological Specimens
Various (including Ammonoidea)
fossil
Fossiliferous limestone
Bioclastic carbonate rock, primarily calcite (CaCO₃), containing fossil shell fragments and molds
fossil
Limestone countertop or floor tile
Calcite-rich limestone, composed mainly of calcium carbonate (CaCO₃)
sedimentary
Polished fossil-bearing shale or mudstone
Fossiliferous carbonaceous mudstone/shale; visible fossils may be bivalves or ammonites, but species cannot be confirmed from the image
fossil
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Polished fossiliferous limestone, likely fossil shell fragment
Calcite-rich limestone (CaCO₃), possibly bioclastic/coquina limestone
fossil
Fossilized Shell or Coral Fragment in Matrix
Invertebrate Fossil in Sedimentary Rock
fossil
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
sedimentary
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineral
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Crinoid Stem Fossil in Limestone
Crinoidea (class) in Calcium Carbonate (CaCO3) matrix
fossil
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
sedimentary