Igneous And Fossil

Fossil Coral (Petoskey / Favosites)

Favosites sp. / Hexagonaria sp. (Calcite/Silica pseudomorph)

Crinoid stem fossil

Crinoidea

Fossilized Shark Tooth

Carcharocles sp. or similar Lamniformes

Crinoid Fossil in Limestone

Crinoidea (class) in Fossiliferous Limestone

Rugose Coral Fossil (Horn Coral)

Order Rugosa (common genera include Zaphrentis or Heliophyllum)

Gastropod Fossil (Snail Steinkern)

Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)

Shark Tooth Fossil

Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)

Cockle Shell Fossil

Cardiidae family (Bivalvia)

Cockle Shell Fossil

Cardium (Bivalvia)

Fossil Shark Tooth

Chondrichthyes (Class)

Coal (Bituminous Coal)

Caustobiolith / Sedimentary Rock

Fossilized Ripple Marks or Stromatolite

Sedimentary ripple mark imprint / Biosedimentary structure

Fossilized Coral (Rugose or Tabulate) or Stromatolite

Phylum Cnidaria / Stromatolithus

Crinoid Stem Fossil

Crinoid columnal (Echinodermata)

Fossil Shark Tooth

Chondrichthyes (class)

Rugose Coral Fossil

Rugosa (Order) / Horn Coral

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Fossiliferous Kalkstein (Marl/Sandstone)

Fossiliferous calcarenite/siltstone

Bivalve Fossil (Internal Mold/Steinkern)

Class Bivalvia (Fossilized Mold)

Spinosaurus Tooth

Spinosaurus aegyptiacus (fossilized in Hydroxyapatite)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

Calcite-rich sedimentary rock with invertebrate fossils (CaCO3)

Granite pebble

Granite; chiefly quartz, feldspar, and mica

Weathered granite or granitic gneiss fragment

Quartz–feldspar–mica granite; possibly foliated granitic gneiss

Tumbled pegmatitic granite

Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and biotite or amphibole

Granite (specifically Pink Granite)

Phaneritic Plutonic Rock (High Potassium Feldspar Granite)

Fossilized Brachiopod

Phylum Brachiopoda

Goniatite Fossil

Order Goniatitida

Fossiliferous Chert or Limestone

Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)

Weathered fossil shell or crinoid fragment

Likely fossilized echinoderm or bivalve fragment; exact taxon indeterminate from the image

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Orthoceras Fossil Limestone

Orthoceras sp. (Calcium Carbonate, CaCO3)

Granite

Phaneritic Igneous Rock (Granoid)

Fossil Brachiopod Cast (Atrypa species)

Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida

Fossilized wood (petrified wood)

Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue

Vesicular basalt (possibly weathered scoria)

Basalt; chiefly plagioclase feldspar, pyroxene, and iron-rich minerals

Tumbled orbicular granite (likely orbicular diorite)

Orbicular granitoid; chiefly quartz, feldspar, and dark amphibole/biotite minerals

Turritella Fossil

Turritella (Class Gastropoda, Family Turritellidae)

Possible fossilized bone fragment

Indeterminate mineralized bone; taxon and age cannot be determined from the photo

Devil's Toenail

Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)