Igneous And Fossil

Fossilized Shark Tooth (likely Sand Tiger Shark)

Carcharias taurus (fossilized hydroxyapatite/calcium phosphate)

Fossil-bearing limestone

Bioclastic limestone, likely containing bivalve or brachiopod impressions

Fossiliferous shale or mudstone with plant fossils

Carbonaceous mudstone/shale containing fossilized foliage, likely fern or seed-fern impressions

Fossilized coral or bryozoan limestone

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

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Fossiliferous limestone

Bioclastic carbonate rock, predominantly calcite (CaCO₃)

Orbicular rhyolite (likely)

Silica-rich volcanic rock, chiefly quartz and feldspar with orbicular aggregates of feldspar, quartz, and mafic minerals

Fossiliferous Limestone

Calcium carbonate matrix with macrofossils (CaCO3)

Fossil shark tooth

Likely fossilized shark tooth, possibly Carcharhinus or a related requiem shark

Sea Urchin Fossil

Echinoidea (test/fossil)

Orbicular rhyolite (orbicular jasper-like volcanic rock)

Silica-rich rhyolite containing concentric feldspar–quartz orbicules, commonly with iron-oxide staining

Fossiliferous limestone with a fossil sea urchin

Bioclastic limestone containing an echinoid fossil (class Echinoidea)

Pyrite

Iron Sulfide (FeS2)

Fossiliferous limestone, possibly a weathered shell or bone fragment

Calcite (CaCO₃) fossil material in limestone; exact fossil identification is uncertain from the image

Fossil gastropod shell

Gastropoda; species cannot be determined from the image

Fossiliferous limestone

Bioclastic carbonate rock, primarily calcite (CaCO₃)

Fossiliferous limestone with silicified fossil material

Bioclastic limestone; likely marine mollusk/coral fragments, locally replaced by chalcedony or calcite

Small reddish-brown mineral fragment, likely quartz-bearing rock

Indeterminate; possibly iron-stained quartz or feldspar-rich stone

Vesicular basalt (pumice-like volcanic stone)

Vesicular basalt; primarily plagioclase, pyroxene, olivine, and volcanic glass

Fossiliferous limestone with a possible shell or trace fossil

Calcitic limestone (mostly CaCO₃), fossil identity indeterminate from the image

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)

Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)

Fossil coral

Likely colonial rugose coral (e.g., Lithostrotion or Hexagonaria), replaced by calcite

Fossilized honeycomb coral

Fossil coral, commonly Favosites or related tabulate coral

Fossil bivalve shell fragment

Likely a ribbed oyster or scallop-type bivalve; exact genus requires locality and preservation details

Weathered granitic rock

Granite, chiefly quartz + feldspar + mica; possibly a pale granodiorite

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Fossil Shell

Invertebrate fossil (Mollusca)

Bivalve Fossil (Clam Fossil)

Class Bivalvia (likely Gryphaea or similar Order)

Fossiliferous limestone, likely with a coral or stromatoporoid fossil

Calcite (CaCO₃) limestone containing fossilized marine skeletal material

Polished fossil tooth, likely shark tooth

Fossilized selachian tooth; possible sand tiger shark (Carcharias sp.) or related lamniform

Possible fossilized tooth fragment

Indeterminate fossil enamel/dentine; possibly shark tooth fragment

Silicified fossil shell, likely fossil oyster or clam

Silicified bivalve fossil; shell originally aragonite/calcite, partly replaced by chalcedony (SiO₂)

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Fossiliferous Shale

Fossiliferous Mudstone / Shale

Tumbled septarian nodule fragment (probable)

Septarian calcite–aragonite concretion with brown clay/mudstone matrix

Fossilized Bone Chunk

Permineralized Vertebrate Bone (indeterminant)

Tumbled, weathered limestone or calcareous concretion

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Fossiliferous limestone, likely coral or shell-rich limestone

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

Light-gray river pebble

Indeterminate; likely fine-grained quartz-rich rock such as quartzite or pale granite

Rounded quartz-rich pebble, possibly granite or gneiss

Indeterminate granitoid; likely quartz–feldspar–biotite aggregate

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Fossils

Fossiliferous Limestone (Crinoidal)

Calcite-bearing bioclastic packstone (CaCO3)