Mineralized Fossil

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Quartz-rich breccia or altered granite fragment

Polymineralic quartz–feldspar rock, likely hydrothermally altered granite/pegmatite

Weathered brown mineralized rock

Likely iron-stained quartzite or quartz-rich metamorphic rock; exact identification requires testing

Fossilized gastropod (snail)

Gastropoda indet.; likely a mineral-replaced or steinkern fossil

Limonite pseudo-concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Polished fossiliferous chert or silicified limestone pebble

Microcrystalline quartz (SiO₂), possibly with calcite and iron-oxide inclusions

Weathered sandstone cobble

Clastic sandstone, likely quartz-rich arenite or arkose

Petrified Wood

Silicified wood (SiO2)

Ammonite Fossil

Ammonoidea

Rounded iron-rich cobble (likely lateritic sandstone or ironstone)

Ferruginous sandstone/ironstone; chiefly quartz (SiO₂) with iron oxides, especially hematite (Fe₂O₃) and goethite (FeO(OH))

Dark igneous rock, possibly basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, with possible olivine or iron oxides

Iron-rich sandstone or weathered lateritic rock

Ferruginous sandstone; chiefly quartz (SiO₂) with iron oxides/hydroxides such as hematite and goethite

Rounded porphyritic volcanic rock, likely andesite or rhyolite

Fine-grained silicate rock; likely plagioclase- and quartz/feldspar-bearing andesite–rhyolite

Weathered iron-rich rock, possibly basalt or ironstone

Likely vesicular basalt or ferruginous breccia; exact identification requires testing

Iron-rich concretion or weathered ironstone nodule

Goethite–hematite-rich limonite concretion (tentative)

Quartz-rich metamorphic rock, likely quartzite or vein quartz

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and feldspar

Rounded iron-rich pebble

Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing

Pyrite

Iron Disulfide (FeS2)

Crinoid stem fossil

Crinoidea

Fossilized Stingray Mouth Plate

Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)

Fossiliferous limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃)

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Possible ironstone concretion or weathered mineral nodule

Iron-oxide-rich concretion, likely goethite/limonite; identification uncertain from the photo

Likely fossiliferous limestone or dolostone

Micritic limestone, chiefly calcite (CaCO₃), possibly dolomitized; apparent fossil or stylolitic markings

Vesicular basalt (scoria-like volcanic rock)

Vesicular basalt, primarily plagioclase feldspar, pyroxene, and olivine

White coral limestone (probable fossiliferous limestone)

Calcite (CaCO₃), commonly derived from aragonitic coral skeletons recrystallized to calcite

Polished moss agate

Moss agate, a variety of chalcedony (microcrystalline quartz, SiO₂)

Fossiliferous limestone

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

Brown Quartz (Jasper or Chert)

Silicon Dioxide (SiO2)

Polished fossil coral

Agatized or silicified coral, commonly fossilized stony coral (Scleractinia); exact genus cannot be determined from the image

Polished jasper pebble

Jasper (microcrystalline quartz, SiO₂)

Crinoid Stem Fossil

Class Crinoidea (Echinodermata)

Fossilized Rugose Coral in Limestone

Order Rugosa in Sedimentary Matrix (CaCO3)

Fossilized Favosites Coral (Honeycomb Coral)

Favosites (extinct genus Table Coral)

Petrified Wood

Agatized or Silicified Wood (SiO2)

Rugose Coral Fossil (Horn Coral)

Order Rugosa

Fossilized Brachiopod

Brachiopoda (e.g., Atrypa or Rhynchonellida)

Fossilized Trilobite or Mollusk Fragment

Phylum Arthropoda / Mollusca fossil in sedimentary matrix

Crinoid Stem Fossil

Crinoida (columnal ossicles)

Bivalve Fossil (Clam Shell)

Class Bivalvia

Bivalve Fossil (Mussel or Clam Shell)

Bivalvia

Fossil Plant Impression (Calamites)

Calamites sp. (Tracheophyta: Equisetopsida)