Vesicular basalt (likely weathered scoria)
Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and olivine with vesicles
igneous
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Stromatolite (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Fossilized Bryozoan
Bryozoa
fossil
Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossil Sand Dollar (Echinoidea)
Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)
sedimentary
Petrified Wood
Fossilized plant material (Silicon dioxide - SiO2)
fossil
Amber (Green variation)
Succinite
fossil
Fossiliferous limestone
Bioclastic carbonate rock, chiefly calcite (CaCO₃)
sedimentary
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Fossilized Brachiopod Shell / Mold
Phylum Brachiopoda (Fossilized organic matrix replaced by Silica/Calcite)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with organic fossil inclusions
sedimentary
Amber
Fossilized tree resin
gemstone
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Fossilized Horn Coral
Rugosa (Tetracoralla)
fossil
Fossiliferous Flint or Chert with Bryozoan Fossils
Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions
sedimentary
Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Limestone with Fossil Inclusion
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (Fossilized Resin)
fossil
Brachiopod Fossil
Phylum Brachiopoda (poss. Order Spiriferida or Rhynchonellida)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Fossiliferous Limestone
Carbonate Sedimentary Rock (primarily CaCO3)
sedimentary
Fossilized Shark Tooth
Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)
sedimentary
Mammoth Tooth
Mammuthus tooth
fossil
Coprolite
Fossilized Feces
fossil
Amber
Succinite / Fossilized Resin (C10H16O)
fossil
Amber
Succinited (fossilized tree resin)
fossil