Mineralized Fossil

Polished dendritic agate pendant

Microcrystalline quartz (SiO₂), with dark manganese- or iron-oxide dendrites

Polished amber

Amber (fossilized plant resin; chiefly amorphous organic compounds)

Fossilized Bone

Permineralized Vertebrate Bone

Tumbled septarian nodule fragment (probable)

Septarian calcite–aragonite concretion with brown clay/mudstone matrix

Weathered limestone

Calcitic limestone, mainly calcium carbonate (CaCO₃)

Fossilized Coral (Petrified Coral)

Anthozoa (Scleractinia)

Fossilized Coral

Cnidaria (Hexacorallia)

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Fossilized Echinoid (Sea Urchin) or Brachiopod

Echinoidea / Invertebrate Fossil

Granite with Hematite staining

Granitoid (Quartz, Feldspar, Mica) with Iron Oxide (Fe2O3)

Epidosite (Epidote-Quartz rock)

Epidote-rich hydrothermal rock

Likely coral fragment or calcareous fossil

Aragonite/calcite (CaCO₃), possibly fossil coral such as Pocillopora or a bryozoan

Dendritic Agate

Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions

Fossil bivalve shell

Bivalvia; shell composed mainly of calcium carbonate (typically aragonite and/or calcite)

Coprolite

Fossilized Feces

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Fossil coral

Colonial scleractinian coral fossil, likely a tabulate or honeycomb coral; exact genus requires microscopy

Sandstone concretion

Arenite sedimentary rock (concretion/nodule)

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone

Quartz-rich breccia or vein quartz

Quartz (silicon dioxide, SiO₂), likely with iron-oxide staining and other pale gangue minerals

Quartz vein rock, likely iron-stained quartzite or hydrothermal quartz

Mostly quartz (SiO₂), with iron oxides and minor feldspar or mica

Fossiliferous rock fragment (possible shell fossil)

Likely a calcium-carbonate fossil in limestone; exact fossil and host rock are not identifiable from the image

Fossilized Bone Chunk

Permineralized Vertebrate Bone (indeterminant)

Fossilized Rugose Coral (Horn Coral)

Order Rugosa

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Weathered limestone or calcitic fossil/reef fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone

Polished fossiliferous limestone, likely fossil shell fragment

Calcite-rich limestone (CaCO₃), possibly bioclastic/coquina limestone

Fossilized shell-bearing limestone

Bioclastic limestone, likely molluscan/coquina limestone (calcite, CaCO₃)

Fossilized coral (likely tabulate or colonial coral)

Fossil coral; possibly Hexagonaria or related Paleozoic colonial coral

Fossilized Shark Tooth (likely Sand Tiger Shark)

Carcharias taurus (fossilized hydroxyapatite/calcium phosphate)

Ferruginous Sandstone Concretion (Ironstone Phosphorite)

Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)

Fossiliferous limestone, likely coral or shell-rich limestone

Biogenic calcite (CaCO₃), commonly limestone containing fossil coral or mollusks

Quartzite with Epidote

Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

Crinoid Stem Fossil in Chert

Crinoid columnal ossicles (phylum Echinodermata) embedded in microcrystalline quartz (chert)

Crinoid Stalk in Limestone

Crinoid fossil in Biomicrite (Limestone)

Fossiliferous sandstone with plant fossils

Likely fossil-bearing siliciclastic sedimentary rock; apparent fragments may be fossil wood or leaf impressions, but species cannot be determined from the image

Fossil Shell

Invertebrate fossil (Mollusca)

Fossilized Gastropod Internal Mold

Steinkern (Mollusca: Gastropoda)

Weathered sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

Fossilized coral or bryozoan limestone

Calcitic fossiliferous limestone; likely colonial coral/bryozoan fragments, CaCO₃

Fossil-bearing limestone

Bioclastic limestone, likely containing bivalve or brachiopod impressions