Organic Specimen (Fossil)

Fossilized coral (likely colonial coral)

Fossil scleractinian coral; possibly *Thamnasteria* or a related coral

Oyster Shell Fragment

Crassostrea virginica (or related Bivalvia)

Fossil Shark Tooth

Odontaspididae (likely Carcharias sp.)

Petrified Wood

Silicified Wood (primarily SiO2)

Rugose Coral Fossil (Horn Coral)

Order Rugosa

Fossiliferous Limestone with Brachiopod shell

Calcium carbonate (CaCO3)

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Polished agate (likely plume or moss agate)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide and possible chlorite inclusions

Coprolite

Fossilized Feces

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone

Fossil scallop shell

Pectinid bivalve fossil; likely a scallop (family Pectinidae), exact genus/species uncertain

Small weathered fossil or mineral fragment

Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral

Coral Fossil (Favosites)

Favosites (Extinct genus of tabulate corals)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Amber

Succinite (specifically for Baltic amber); approximate formula C10H16O

Fossiliferous Limestone

Calcite-rich Fossiliferous Limestone (CaCO3)

Fossilized coral (likely tabulate or colonial coral)

Fossil coral; possibly Hexagonaria or related Paleozoic colonial coral

Chert Cobble with Crinoid Fossil

Silica (SiO2) with Crinoid ossicle

Fossilized Shark Tooth

Elasmobranchii fossil (likely Odontaspididae family)

Limestone

Calcareous sedimentary rock (CaCO3)

Fossil shell fragment (likely brachiopod or bivalve)

Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia

Petrified Wood

Silicified Wood (SiO2)

Chert (Jasper/Basalt River Pebble)

Silicon Dioxide (SiO2) or Microcrystalline Quartz

Coral Fossil (Agatized Coral or Petoskey Stone)

Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)

Limestone

Sedimentary Rock (Primarily CaCO3)

Amber

Succinite (Organic Mineraloid) - C10H16O

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Sandstone)

Chert (Nodule)

Silicon Dioxide (SiO2)

Fossilized bivalve shell fragment

Fossil mollusk shell, likely a pectinid or related bivalve; original shell composed mainly of aragonite or calcite, now partly mineralized

Chert (containing Fossil Inclusions)

Microcrystalline Quartz (SiO2)

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Fossilized Dinosaur Bone

Perineralized Bone (Fluorapatite/Quartz replacement)

Fossilized Coral

Rugosa / Scleractinia (Agatized or Calcitized Coral)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Petrified Wood

Silicified Wood (SiO2)

Likely fossilized coral with polished blue calcite or aragonite specimen

Fossil coral, commonly Scleractinia; blue material likely dyed or treated calcite/aragonite

Petrified Wood

Silicified Wood (SiO2)

Limestone with Calcite Veining

Sedimentary Carbonate Rock (CaCO3)

Red Jasper with Fossils

Silicified Fossiliferous Jasper (Chert variant, SiO2)

Coal

Anthracite or Bituminous Coal

Fossiliferous Limestone (Crinoid stem fragment)

Crinoidea (Phylum Echinodermata) in Calcite matrix