Whiterock Stage

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The Whiterockian, often referred to simply as the Whiterock, is an earliest or lowermost stage of the

Middle Ordovician.[1][2][3]
Although the Whiterockian or Whiterock Stage refers mainly to the early Middle Ordovician in North America, it is often used in the older literature in a global sense.

The Whitetrock Stage was introduced by Cooper and Cooper (in Cooper, 1956, p. 6–7) "as a post-Canadian – pre-Chazyan chrono-stratographic unit" based on strata "in the

Taconic Orogeny.[5]

The Whiterock Stage is given a range from 471.8 (ca. 472) to 462 m.y.a., spanning close to 10 million years. Officially its start is defined by the potentially lowest occurrence of the conodont

Chazyan
of North America.

References

  1. ^ Flower, R.H. 1964, The Nautiloid Order Ellesmeroceratida (Cephalopoda) Memoir 12; New Mexico Bureau of Mines and Mineral Resources,Socorro,NM
  2. ^ Flower, R.H. 1971; Cephalopods of the Whiterock Stage; Smithsonian Contributions to Paleontology, No.3, 101–111, 1971
  3. ^ Salvadore, A. 1985; COSUNA Stratigraphic Correlation Charts, United States. AAPG Bul Vol 69, no,2, 181–189, Feb 1985.
  4. ^ Fahraeus, Lars E. 1977. Correlation of the Canadian/Champlainian series boundary and the Whiterock stage of North America with Western European conodont and graptolite zones. Bul Canadian Petroleum Geology, Sept 1977, V. 25, no 5, 981–994.
  5. ^ R.J Ross, jr. et al 1991. Stratotype of Ordovician Whiterock Series. Palaios. 1991, V.6 p. 156–173.
  6. ^ GeoWhen Database.
  • Cooper, G.A, 1965. Chazyan and related brachiopods: Smithsonian Misc. Coll. 127 ....
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