Topic summary
Hardground
Extracted from the Wikipedia article Carbonate hardgrounds.
Gallery
- Hardground in the Liberty Formation (Upper Ordovician) of southern Ohio.
- Cross-section of an Upper Ordovician hardground from Kentucky. The light-colored vertical elements are borings (Trypanites) filled with dolomite. The scale bar is 1.0 cm.
- A Middle Ordovician hardground from the Kanosh Formation of Utah with echinoderm holdfasts cemented to its upper surface. The scale bar is 1.0 cm.
- Petroxestes borings in an Upper Ordovician hardground, southern Ohio.
- Trypanites borings in an Upper Ordovician hardground, Indiana.
- Carbonate hardground with an encrusting bryozoan; Kanosh Formation (Middle Ordovician) of Utah; scale in mm.
- Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites); Carmel Formation (Middle Jurassic) of southern Utah.
- Trypanites borings in an Upper Ordovician hardground from northern Kentucky.
- Carbonate hardground; Ora Formation, Upper Cretaceous (Turonian), southern Israel.