Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
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Fossilized Crinoid Stem Columnal
Phylum Echinodermata; Class Crinoidea (CaCO3)
sedimentary
Fossiliferous Shale or Slate with Plant Fossils
Fossil-bearing argillaceous rock
Sedimentary/Metamorphic
Likely vertebra fossil or bone fragment
Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)
fossil
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Fossil Coral (Petoskey Stone or Favosites)
Favosites (specifically Hexagonaria percarinata if silica-replaced Michigan type)
sedimentary
Banded Iron Formation (BIF) with potential Stromatolite/Biogenic Trace
Ferruginous Chert / Banded Iron Formation (BIF)
sedimentary
Calamites (Fossil Plant)
Calamites (Genus), belonging to the class Equisetopsida
sedimentary
Belemnite Fossil (Guardsman Fossil)
Belemnitella spp. (Rostrum)
fossil
Oolitic Chert
Oolitic Microcrystalline Quartz (SiO2)
sedimentary
Tabulate Coral Fossil (Favosites)
Favosites (Commonly known as Honeycomb Coral)
sedimentary
Fulgurite
Lechatelierite (Silica glass tubes)
mineral
Echinoid Fossil / Fossilized Sea Urchin
Echinoidea
fossil
Fossilized Shark Teeth in Matrix
Cretaceous Chondrichthyes (Shark) remains in Sedimentary Matrix
fossil
Mookaite Jasper
Radiolarite (Silica, SiO2)
sedimentary
Septarian Nodule (Dragon Stone)
Calcite-Aragonite-Limestone Septarian
sedimentary
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Honeycomb Coral Fossil (Favosites)
Favosites alpenensis
sedimentary
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
sedimentary
Coral Fossil
Scleractinia (Class Anthozoa)
fossil
Fossil Coral
Hexagonaria / Rugose coral (Fossilized calcium carbonate)
fossil
Fossilized Syringopora (Piping Organ Coral)
Syringopora (Extinct Genus of Tabulate Coral)
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Bone Fossil
fossil
Sandstone (Quartzose / Feldspathic Sandstone)
Arenite (SiO2 principal matrix)
sedimentary
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Fossilized Oyster (Devil's Toenail)
Gryphaea (extinct genus of bivalve mollusks)
sedimentary
Fulgurite
Lechatelierite (Silica glass tube)
mineral
Chert (with Calcite layering)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Iridescent Ammonite
Ammonoidea (Species: likely Cleoniceras or Desmoceras); Mineral: Aragonite/Ammolite (CaCO3)
sedimentary (fossilized)
Brachiopod Fossil in Chert
Phylum Brachiopoda within Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
fossil
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Dendritic Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a concretionary structure
sedimentary
Fossilized bone, likely a tooth or jaw fragment
Mineralized vertebrate bone; taxonomic identification requires clearer diagnostic anatomy
fossil
Bivalve Fossil (Clam)
Class Bivalvia (Calcium Carbonate, CaCO3)
sedimentary