Hebron, thrombolitic mounds (Ordovician of the United States)

Also known as Reef 2633

Where: Augusta County, Virginia (38.1° N, 79.2° W: paleocoordinates 31.7° S, 72.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Canadian (485.4 - 457.3 Ma)

• middle Chepultepec/Stonehenge Formation, Lower Canadian

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified limestone

• developed near or below fair-weather wave base in deeper, quieter water
• muddy bioherm

Size class: macrofossils

Primary reference: J. A. Bova and J. F. Read. 1987. Incipiently drowned facies within a cyclic peritidal ramp sequence, Early Ordovician Chepultepec interval, Virginia Appalachians. Geological Society America Bulletin 98:714-727 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 80570: authorized by Wolfgang Kiessling, entered by Uta Merkel on 28.04.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Chlorophyceae
 Dasycladales - Dasycladaceae
Dasycladaceae indet. Kutzing 1843
Nuia
  -
Nuia sp. Maslov 1954
unclassified
  -
Porifera indet. Grant 1836
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Trilobita
  -
Trilobita indet. Walch 1771 trilobite
Hormogoneae
 Oscillatoriales - Girvanellaceae
Girvanella sp. Nicholson and Etheridge 1878