Igneous And Fossil

Belemnite Fossil (Guardsman Fossil)

Belemnitella spp. (Rostrum)

Crinoid Fossil Fragment

Crinoid stem fossil (Echinodermata)

Fossiliferous Rock (Invertebrate Fossil in Matrix)

Fossiliferous limestone or shaly matrix containing skeletal fossil remains

Granite pebble

Granite; chiefly quartz, feldspar, and mica (variable composition)

Tumbled pegmatitic granite

Granite, chiefly quartz–feldspar–mica; likely altered pegmatite

Vesicular volcanic rock, likely pumice or scoria

Vesicular rhyolitic–andesitic volcanic rock; predominantly silicate glass with feldspar and possibly pyroxene

Fossilized Bivalve in Limestone

Class Bivalvia within Sedimentary Matrix (likely CaCO3)

Fossilized Trilobite Pygidium / Glabella Fragment

Trilobita (e.g., Phacops or Ceraurus sp.)

Pegmatitic granite

Granite, composed mainly of quartz, feldspar, and mica

Vesicular volcanic rock, likely pumice or weathered scoria

Pumice/scoria; predominantly volcanic glass and plagioclase, with possible pyroxene or iron oxides

Echinoid Fossil (Sea Urchin Fossil)

Echinoidea

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone (SiO₂) with iron-oxide staining; exact identification requires testing

Weathered vesicular volcanic rock (likely pumice or altered basalt)

Vesicular basalt–pumice, compositionally uncertain

Vesicular volcanic rock, likely pumice

Pumice; highly vesicular volcanic glass, commonly rhyolitic to dacitic in composition

Tumbled fossil coral or carbonate fossil fragment

Likely fossilized coral, composed mainly of calcite (CaCO₃); exact identification is uncertain from the image

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone

Weathered limestone fragment

Calcitic limestone (mostly CaCO₃; possibly micritic limestone)

Petrified Wood

Silicified Wood (SiO2)

Weathered granitoid (likely granite or granodiorite)

Granite–granodiorite; primarily quartz, feldspar, and mica

Weathered limestone or calcareous tufa

Calcite-rich carbonate rock, primarily CaCO₃ (often micritic limestone or travertine/tufa)

Tumbled fossiliferous limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous micrite

Turritella Agate (Elimia Agate)

Silicified Elimia tenera (formerly misidentified as Turritella)

Weathered quartz-bearing rock fragment

Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining

Coral fossil (likely fossilized colonial coral)

Calcareous fossil coral; commonly *Scleractinia* or *Tabulate/ rugose coral* (identification requires close pore-pattern examination)

Fossil oyster shell

Fossilized bivalve, likely Ostrea or a related oyster genus; calcite (CaCO₃) shell

Rounded river pebble, likely quartz-rich sandstone or fine-grained granite

Indeterminate from photograph; possible quartz/feldspar-bearing granitic pebble

White quartz pebble (probable)

Quartz, silicon dioxide (SiO₂)

Fossiliferous limestone / shell hash rock

Bioclastic limestone (calcarenite or coquina), dominantly CaCO₃

Likely weathered quartz-bearing rock fragment

Indeterminate; possibly granitic or metamorphic quartz–feldspar aggregate

Fossil Coral

Rugose or Tabulate Coral Fossil (CaCO3 replacement)

Fossil Coral

Rugose Coral or Tabulate Coral (Phylum Cnidaria)

Fossiliferous limestone

Bioclastic limestone, likely containing brachiopod or bivalve impressions

Pyrite

Iron Disulfide (FeS2)

Weathered sandstone or fine-grained graywacke

Clastic sedimentary rock; chiefly quartz (SiO₂), feldspar, and lithic fragments bound by silica, calcite, or iron-oxide cement

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Fossil-bearing limestone slab

Bioclastic limestone, likely containing brachiopod or bivalve impressions

Fossiliferous limestone

Calcitic limestone, primarily calcium carbonate (CaCO₃), with visible shell or coral fossils

Rounded river pebble

Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock

Vesicular basalt (likely iron-rich volcanic scoria)

Basalt; predominantly plagioclase, clinopyroxene, olivine, and iron oxides

Vesicular volcanic rock, likely pumice or scoria

Pumice (highly vesicular rhyolitic–dacitic volcanic glass) or scoria (vesicular basaltic rock)