Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Fossilized Horse Tooth
Equus ferus caballus (fossilized molar/premolar)
fossil
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Polished ammonite fossil
Ammonite, an extinct cephalopod; commonly polished specimens are from Jurassic or Cretaceous forms
fossil
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Fossilized Gastropod in Limestone
Gastropoda (Class) in Calcium Carbonate (CaCO3)
sedimentary
Large bivalve shell fossil (possibly a clam)
Fossilized bivalve; exact taxon cannot be determined from the image
fossil
Amber (Copal)
Succiniferous Resin
mineraloid
Sandstone
Arenite (SiO2 based)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossiliferous Limestone (with Coralline Inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone (Murchisonia/Gastropod Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossilized bivalve shell
Bivalvia indeterminate; likely a preserved clam or cockle shell, composed mainly of calcium carbonate (CaCO₃)
fossil
Sandstone
Arenite
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Fossilized Tabulate Coral
Favosites (Honeycomb Coral)
fossil
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Polished amber-colored stone, possibly chert or jasper
Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)
White River Group (Brule and Chadron Formations)
sedimentary
Fossilized bivalve shell
Fossil Mollusca; likely a cemented or infaunal bivalve, possibly oyster or clam
fossil
Fossilized Shell Fragment
Bivalvia or Gastropoda (Class) fragment
fossil
Fossilized Shark Tooth
Otodus obliquus (Mackerel Shark)
sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (order), specifically Neohibolites or similar genera depending on age
sedimentary
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid
Petrified Wood
Silicon Dioxide Fossilized Wood (SiO2)
fossil
Fossilized Shark Tooth
Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)
sedimentary
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary