Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Mineral, Sediment
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Sandstone Concretion (Omar or Nut Rock)
Sedimentary Concretion (specifically an 'Omarolluk' or Omar)
sedimentary
Fossilized turtle shell fragment
Testudines indeterminate; shell bone permineralized with silica/carbonate minerals
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Shark Tooth Fossil
Elasmobranchii dentition (fossilized)
fossil
Likely fossilized shell or carbonate concretion
Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)
fossil
Concretion
Septarian or Siderite Concretion
sedimentary
Limitation Concretion
Ironstone Concretion (Goethite/Limonite)
sedimentary
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Concretion (Sandstone)
Sandstone Concretion
sedimentary
Sandstone Concretion
Sedimentary Concretion (SiO2 or CaCO3 cemented)
sedimentary
Fossil Shark Tooth
Elasmobranchii tooth fossil (e.g., Otodus / Carcharocles)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
sedimentary
Shale
Argillaceous Sedimentary Rock
sedimentary
Petrified Wood
Silicified Wood (Permineralized wood)
fossil
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Fossilized Shark Tooth
Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)
mineral
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Hematite) inclusions
sedimentary
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Phantom Quartz (Chlorite Inclusion)
Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Al)6(Si,Al)4O10(OH)8
mineral
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Botryoidal calcite (likely calcite concretion)
Calcite, calcium carbonate (CaCO₃)
mineral
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Jasper containing fossilized inclusions
Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions
sedimentary
Sandstone with Trace Fossils
Quartz Arenite with Bioturbation (Trace Fossils)
sedimentary
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
Mineral / Sedimentary setting