Man Made Composite (Lithified Equivalent Of Sedimentary)

Black Limestone with Calcite Veins

Limestone (Calcium Carbonate, CaCO3)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Fossil-bearing limestone (possible shell fossil)

Fossiliferous limestone, composed mainly of calcite (CaCO₃)

Rounded sandstone pebble

Quartz-rich sandstone (primarily SiO₂), possibly arkosic sandstone

Likely weathered limestone or calcareous sandstone

Calcite-rich carbonate rock; predominantly CaCO₃, possibly micritic limestone

Banded chert or siliceous shale

Microcrystalline quartz (SiO₂), possibly interbedded with carbonaceous or clay-rich shale

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; composition predominantly SiO₂

Weathered limestone

Calcitic limestone, mainly calcium carbonate (CaCO₃)

Rounded sedimentary pebble, likely mudstone or shale

Argillite/mudstone; predominantly compacted clay minerals with quartz and iron oxides

Likely limestone

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

Chert

Microcrystalline Quartz (SiO2)

Likely fossiliferous limestone fragment

Calcareous fossil assemblage, chiefly calcium carbonate (CaCO₃), possibly crinoid, bivalve, or bryozoan material in limestone

Chert

Silicon dioxide (SiO2)

Porous limestone fragment

Calcite-rich limestone (CaCO₃), possibly bioclastic limestone

Weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining

Weathered sandstone or iron-stained sedimentary pebble

Quartz-rich sandstone; primarily SiO₂ with iron-oxide staining

Chert (with Epidote/Quartz veining)

Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic inclusions

Gowganda Tillite (Puddingstone)

Glacial Diamictite (Gowganda Formation)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Sandstone

Arenite (SiO2 based typically)

Polished fossil-bearing limestone

Fossiliferous micritic limestone, likely containing gastropod or ammonoid fragments

Rounded quartz-rich river pebble

Likely quartzite or silicified sandstone; predominantly microcrystalline quartz (SiO₂), possibly with feldspar and iron-oxide staining

Weathered feldspathic sandstone

Quartz–feldspar arenite, likely arkose

Sandstone

Arenite (SiO2 composition dominant)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Sandstone

Arenite (primarily SiO2)

Tumbled polymictic stone, likely jasper-bearing conglomerate

Siliciclastic conglomerate with microcrystalline quartz (jasper/chert) and altered volcanic or feldspathic clasts

Sandstone

Arenite (variable SiO2 composition)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

Porous limestone (likely fossiliferous limestone)

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃), possibly bioclastic or reef limestone

Water-worn gray sandstone or quartzite pebble

Quartz-rich sandstone (possibly weakly metamorphosed quartzite), chiefly SiO₂

Weathered limestone

Calcite-rich limestone (primarily CaCO₃)

Polished fossiliferous limestone (probable crinoidal limestone)

Calcite-rich limestone; chiefly CaCO₃, with possible crinoid fossil fragments

Weathered limestone

Calcite-rich carbonate rock; predominantly CaCO₃