Pitted Limestone with Honeycomb Weathering
Karst-weathered fossiliferous limestone (CaCO3)
sedimentary
Category
Sedimentary (Silicified Fossiliferous Chalcedony)
Browse sedimentary (silicified fossiliferous chalcedony) specimens identified by the Rock Identifier community.
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Fossiliferous Chert or Agate
Microcrystalline quartz (SiO2) with fossiliferous inclusions
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Script Jasper
Cryptocrystalline Quartz (SiO2) with fossiliferous inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Crinoid Stem Fossil (in Chert or Limestone Matrix)
Crinoidea (Class) - Calcium Carbonate (CaCO3)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of Tabulate Coral)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Light-colored weathered rock fragment
Likely limestone or calcareous sandstone; exact identification is uncertain from the photograph
sedimentary
Mookaite Jasper
Mookaite (Silicified radiolarite, SiO2)
sedimentary
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Jasper and Quartz Breccia
Silicified Breccia / Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2 with impurities)
sedimentary
Cream River Jasper
Silicified microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Red Jasper Conglomerate (Puddingstone)
Silicified Conglomerate (SiO2 with inclusions)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Fossil Shell (Brachiopod or Mollusk)
Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)
fossil
Limestone Pebble with Crinoid Fossil
Calcium Carbonate (CaCO3) - Fossiliferous Limestone
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Agatized or Silicified Wood (SiO2)
fossil
Polished carved coral fossil (likely agatized or silicified coral)
Fossilized colonial coral; commonly *Scleractinia* or *Tabulata*, replaced by chalcedony/microcrystalline quartz
fossil
Limestone
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Polished/tumbled chalcedony (likely agate or jasper)
Microcrystalline quartz, SiO₂; possibly quartz-rich silicified material
mineral
Weathered fossiliferous limestone
Calcitic limestone; predominantly CaCO₃, possibly containing a fossil mold or shell fragment
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Jasper and Mudstone Composite
Silicified Sedimentary Rock / Jasperoid Pebble
sedimentary
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished leopard-skin jasper (likely orbicular jasper)
Silicified microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; composition varies by locality
metamorphic