Fossil

Sandstone

Arenite

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Weathered Sandstone with Algae Growth

Arenite

Crinoid Fossil in Limestone

Class Crinoidea in Carbonate Matrix (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Fossiliferous Limestone (Coquina / Shell Conglomerate)

Bioclastic Limestone (composed primarily of CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Sandstone (Pebble)

Clastic sedimentary rock (SiO2 primary)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Coquina / Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate - CaCO3)

Ironstone Concretion (Siderite Nodules)

Siderite (FeCO3) in Mudstone or Sandstone matrix

Fossilized Oyster Shell

Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Fossiliferous Limestone (Gritstone/Marl)

CaCO3 (Calcium Carbonate) with Fossil Inclusions

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

Porous Quartzite

Metamorphosed Quartz-rich Sandstone (SiO2)

Hag Stone

Perforated Chert (Microcrystalline Silica, SiO2)

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Sandstone

Arenite (primarily SiO2)

Fossilized Brachiopod

Brachiopoda (Class Rhynchonellata or Spiriferida)

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Petoskey Stone

Hexagonaria percarinata

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Sea Urchin (Echinoid)

Echinoidea (Class); commonly Clypeasteroida for sand dollar types

Orthoceras Fossil in Limestone

Orthoceras regulare (Class Cephalopoda; Order Orthocerida)

Fossiliferous Limestone

Calcareous biomicrite / Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood / Chalcedony (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth

Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)