Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Knightia Fish
Knightia eocaena (set in fossiliferous Micritic Limestone)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone (River Rock)
Arenite (SiO2 principal component)
sedimentary
Chert (Fossiliferous Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Coral
Rugose Coral (Order Rugosa) or Tabulate Coral
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicon Dioxide Fossilized Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Weathered limestone fragment
Limestone, predominantly calcite (CaCO₃)
sedimentary
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Sandstone or Mudstone
Sedimentary Rock (Sandstone/Mudstone)
sedimentary
Fossil Shark Tooth
Elasmobranchii (Lamniformes order likely)
fossil
Fossil-bearing limestone
Bioclastic limestone, likely containing a brachiopod or bivalve imprint
fossil
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Orthoceras fossil in limestone
Orthoceras (extinct genus of cephalopod)
sedimentary
Fossil Rugose Coral (Horn Coral)
Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
CaCO3 (Mainly Calcite or Aragonite)
sedimentary
Fossil Coral / Petrifed Coral Agate
Silicified Anthozoa (Agatized Coral)
fossil
Soft Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Stromatolite
Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
sedimentary
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary