Sedimentary (Fossiliferous)

Fossiliferous limestone with a possible shell or trace fossil

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

Polished fossiliferous limestone, likely fossil shell fragment

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

Light-colored carbonate pebble, likely limestone

Limestone; predominantly calcite (CaCO₃), possibly micritic or fossiliferous

Quartz-rich sandstone

Clastic sandstone, primarily quartz (SiO₂) grains with iron-oxide or clay cement

Rounded limestone pebble

Limestone, primarily calcite (CaCO₃), possibly micritic or fossiliferous

Calcite-rich limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly micritic or fossiliferous

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or dolomitic

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic

Flint with Fossil

Silicon dioxide (SiO2) microcrystalline quartz with fossiliferous inclusions

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone (SiO₂-dominated), possibly metamorphosed to quartzite

Chalky limestone fragment

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Quartz-rich sandstone

Sandstone, composed mainly of quartz (SiO₂) with iron-oxide cement

Sandstone

Quartz-rich clastic sedimentary rock, commonly arkose or lithic sandstone

Yellow-brown chert or silicified rock fragment

Microcrystalline quartz (SiO₂), likely chert or chalcedony-rich material

Quartz-rich sandstone

Sandstone, chiefly quartz (SiO₂) with likely feldspar and iron-oxide cement

Brown chert or silicified limestone fragment

Microcrystalline quartz (SiO₂), possibly occurring as chert; exact identification requires testing

Vesicular limestone or calcareous tufa

Calcite-rich carbonate rock; predominantly CaCO₃, commonly aragonite/calcite

Weathered calcite-rich limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly bioclastic

Porous limestone (likely reef or shell limestone)

Calcium-carbonate rock, predominantly calcite (CaCO₃); possibly bioclastic limestone or coquina

Red sandstone

Ferruginous quartz arenite (iron-oxide-cemented sandstone)

Likely limestone fragment

Calcite-rich carbonate rock; primarily calcium carbonate (CaCO₃)

Weathered limestone

Calcite-rich limestone (primarily CaCO₃)

Weathered sandstone

Quartz-rich sandstone, likely ferruginous arkose or subarkose

Weathered sandstone or iron-stained mudstone

Clastic sedimentary rock, likely quartz-rich sandstone (SiO₂) with iron-oxide coatings

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly chalky micritic limestone

Pale weathered pebble, likely limestone

Limestone, predominantly calcite (CaCO₃); exact identification is uncertain from the image

Tumbled red sandstone pebble

Quartz-rich sandstone, commonly iron-oxide-stained (SiO₂-dominant)

Weathered limestone pebble

Limestone, predominantly calcite (CaCO₃)

Small rounded pebble, likely limestone or chalk

Calcium carbonate, predominantly calcite (CaCO₃)

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

Weathered sandstone fragment

Quartz-rich sandstone, primarily SiO₂ grains cemented by silica, iron oxides, or clay

Weathered sandstone

Quartz-rich sandstone (lithified arenite)

Weathered brown stone, likely sandstone or mudstone

Indeterminate clastic sedimentary rock; likely quartz-rich sandstone or lithified mudstone

Rounded limestone pebble

Micritic limestone, primarily calcite (CaCO₃)

Weathered limestone pebble

Limestone; predominantly calcite (CaCO₃)

Weathered chert or siliceous mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly silicified mudstone

Weathered sandstone

Quartz-rich sandstone, likely ferruginous subarkose or arenite

Grey chert or siliceous limestone nodule

Microcrystalline quartz (chalcedony), likely with calcite and clay impurities

Limestone

Calcium Carbonate (CaCO3)

Weathered limestone fragment

Calcite-rich limestone, primarily calcium carbonate (CaCO₃)

Weathered limestone or calcitic cave deposit

Calcite (CaCO₃), likely porous limestone/travertine

Limestone

Calcium Carbonate (CaCO3)