Sedimentary (Fossil)

Gray slate

Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz

Fossiliferous limestone, possibly coral or stromatoporoid fossil

Calcitic limestone; predominantly CaCO₃, with fossilized colonial-organism structures

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Fossilized oyster shell in limestone

Bivalvia fossil; chiefly calcite (CaCO₃)

Fossil Coral / Fossilized Coral

Scleractinia (Anthodiscus / Favia / Montastraea fossil)

Fossiliferous Chert Nodule

SiO2 (Microcrystalline Quartz) with fossil inclusions

Vesicular Sandstone

Clastic Sedimentary Rock (Sandstone)

Sandstone (lithic wake or graywacke)

Clastic sedimentary rock (primarily quartz and lithic fragments)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Fossil Shark Tooth

Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)

Sandstone (with Chert/Quartzite)

Arenite (primarily SiO2)

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Crinoid Marble

Crinoidal Limestone/Marble

Fossil Coral (Rugosa or Solitary Coral)

Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)

Lepidodendron fossil (Scale Tree Bark)

Lepidodendron (Lycophytina class)

Septarian Nodule or Mud Crack Fossil

Septarian Nodule (Concretion)

Rugose Coral (Horn Coral Fossil)

Order Rugosa (fossilized in limestone/chert)

Petoskey Stone (Hexagonaria coral fossil)

Hexagonaria percarinata

Fossilized tooth or tooth fragment

Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

Weathered fossiliferous limestone

Calcite-rich limestone (CaCO₃), possibly containing fossil fragments or stylolites

Limestone (Chalk / Calcite Rock)

Calcium Carbonate (CaCO3)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized coral or porous marine limestone

Likely fossil coral (Scleractinia), composed mainly of calcite/aragonite (CaCO₃)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Reddish sandstone

Quartz-rich sandstone (arenite), commonly iron-oxide stained

Petrified Wood

Silicified Wood (SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Fossil shark teeth

Likely fossilized shark teeth, possibly Carcharhiniformes or related sharks; exact species cannot be determined from the photo.

Fossil Shark Tooth

Elasmobranchii (Class) fossil - possibly Odontaspididae family

Sandstone (Quartzite texture)

Clastic sedimentary rock (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Lepidodendron Fossil (Scale Tree)

Lepidodendron sp.

Polished ammonite fossil

Ammonoidea; likely a polished, chambered ammonite such as Acanthoceras or related Cretaceous form

Fossil shell fragment

Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image

Amber with Fossil Inclusion

Fossilized Tree Resin (Succinite)

Fossil brachiopod shell

Likely spiriferid or strophomenid brachiopod; calcium carbonate (primarily calcite)

Crinoid Stem Fossil

Crinoidea (Class) - Calcium Carbonate (CaCO3)