Sedimentary (Biogenic Sediment Or Biological Remain)

Fossil Shark Tooth

Otodus sp. (Eocene shark fossil)

Red Sandstone / Quartzite Pebble

Quartz Arenite / Quartzite

Banded Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite and Feldspar grains)

Sandstone (Red)

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

Amber-bearing Coal/Sedimentary Rock

Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)

Gravel and Pebbles

Unconsolidated rock fragments (clastic sediment)

Coarse Sand and River Gravel

Siliciclastic Sediment (primarily Quartz and Feldspar)

Hardpan Nodule / Ferruginous Sandstone

Ferruginous Sandstone (Fe-cemented sediment)

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Fossil / Permineralized Bone

Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)

Fossilized Shark Tooth (likely Sand Tiger Shark)

Carcharias taurus (fossilized hydroxyapatite/calcium phosphate)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)

Jasper

Jasper (Silicon Dioxide, SiO2 plus various impurities)

Petrified Wood

Silicified wood (primarily Quartz, SiO2)

Fossilized Shark Tooth

Chondrichthyes (Class)

Banded iron formation pebble

Banded iron formation (BIF), chiefly hematite/magnetite with chert or jasper

Red Jasper (River-worn)

Silicon Dioxide (SiO2) with Hematite inclusions

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)

Jasper

Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)

Greywacke (River Siltstone)

Lithic Sandstone / Greywacke

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Fossilized Horn Coral

Order Rugosa (Calcium Carbonate - CaCO3)

Petrified Wood

Silicified wood (principally SiO2)

Sandstone Concretion

Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)

Chert (Basanite / Flint variation)

Chert (Silicon Dioxide, SiO2)

Picture Jasper (specifically Biggs or Deschutes variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Zebra Marble

Metamorphosed Alabaster/Limestone (CaCO3)

Possible fossilized ammonite or concretion

Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock

Fossil-bearing limestone

Bioclastic limestone, likely containing a brachiopod or bivalve imprint

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Fossilized Shark Tooth

Carcharocles sp. or similar Lamniformes

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Iron-rich concretion (probable limonite/goethite concretion)

Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and goethite (FeO(OH))

Dark gray chert or flint nodule

Microcrystalline quartz (SiO₂), commonly chalcedony/quartz

Iron-rich sandstone or laterite

Ferruginous sandstone; mainly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Weathered sandstone or limestone fragment

Indeterminate clastic carbonate/siliciclastic rock; likely quartz-rich sandstone or porous limestone

Petrified Wood

Silicified Wood (SiO2)

Jasper pebble (Yellow/Brown Jasper)

Silicon Dioxide (Microcrystalline Quartz, SiO2 with Iron Oxide impurities)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities