Crinoid and Coral Fossils in Limestone
Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Chert
Chert (microcrystalline quartz, SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Hag Stone
Perforated Sedimentary Rock (typically Chert or Limestone)
sedimentary
Moss-covered Limestone with Quartz/Calcite Pocket
Calcium Carbonate (CaCO3) rock with biological moss coating
sedimentary
Ironstone concretion (likely limonite/goethite-rich)
Iron-oxide-cemented sediment, commonly goethite (FeO(OH)) and/or limonite
sedimentary
Limestone with Chert
Sedimentary Rock (CaCO3 with SiO2 inclusions)
sedimentary
Amber
Succinite (a fossilized organic resin)
mineral
Likely vertebra fossil or bone fragment
Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)
fossil
Calcite
Calcium Carbonate (CaCO3)
mineral
Likely chert or weathered limestone fragment
Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); identification is limited by the blurred image
sedimentary
Agatized fossil fragment, possibly silicified coral
Chalcedony (microcrystalline SiO₂) replacing carbonate fossil material
fossil
Marine invertebrate fossils (Brachiopods and Gastropods)
Phylum Brachiopoda and Class Gastropoda
fossil
Amber
Succinite
mineraloid
Polished fossiliferous agate
Chalcedony (microcrystalline SiO₂), likely containing fossil coral or stromatoporoid structures
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Tufa
Calcium carbonate (CaCO3) - Porous Limestone
sedimentary
Fossiliferous Limestone
Fossiliferous Calclutite / Bio-calcarenite (CaCO3)
sedimentary
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Likely ironstone concretion
Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite-rich
sedimentary
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Augite Shell / Turret Snail Fossil (or Recent Seashell)
Gastropoda (Class) / Turritellidae (Family)
fossil
Limestone with Algal/Lichen Colonization
Calcium Carbonate (CaCO3)
sedimentary
Sand Dollar Fossil (Echinoidea)
Class Echinoidea (likely order Clypeasteroida), CaCO3 (Calcite)
sedimentary
Fossil bone fragment (likely vertebrate bone)
Fossilized vertebrate bone; exact taxon indeterminate from the photograph
fossil
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Sandstone or Quartzite with algae
Unknown specific, largely SiO2 with biological growth
sedimentary or metamorphic
Fossiliferous Limestone
Fossiliferous Calcilutite / Biomicrite
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Fossilized Brachiopod
Phylum Brachiopoda (General mineral composition: Calcite/CaCO₃ or Silica/SiO₂)
sedimentary
Porous limestone (likely coral limestone)
Calcite-rich carbonate rock; primarily calcium carbonate, CaCO₃
sedimentary
Rounded pale pebble, likely limestone
Micritic limestone, primarily calcite (CaCO₃)
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias sp. (Fossilized Tooth)
fossil
Weathered granitic cobble
Granite, composed mainly of quartz, feldspar, and mica/amphibole
igneous
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Amber
Succinite (fossilized resin)
Organic Mineraloid
Fossil coral fragment
Likely colonial scleractinian coral; calcite/aragonite (CaCO₃)
fossil