The quest for internationally recognized divisions of Cambrian time
- G. Geyer, J. Shergold
- Geology
- 1 September 2000
Duration of the Early Cambrian: U-Pb ages of volcanic ashes from Avalon and Gondwana
- E. Landing, S. Bowring, K. Davidek, S. Westrop, G. Geyer, Wolfram Heldmaier
- Geology
- 1 April 1998
Volcanic zircons from three ashes give a U-Pb date of 511 ± 1 Ma on trilobite-bearing, upper Lower Cambrian (upper Branchian Series) strata of southern New Brunswick that correlate into the Siberian…
LATEST EARLY CAMBRIAN SMALL SHELLY FOSSILS, TRILOBITES, AND HATCH HILL DYSAEROBIC INTERVAL ON THE QUÉBEC CONTINENTAL SLOPE
- E. Landing, G. Geyer, Kenneth E. Bartowski
- Geography, Environmental ScienceJournal of Paleontology
- 1 March 2002
Abstract Latest Early Cambrian continental slope deposition of the early Hatch Hill dysaerobic interval (new name, latest Early Cambrian–earliest Ordovician) is recorded by dark grey shales and…
A unified Lower - Middle Cambrian chronostratigraphy for West Gondwana
- G. Geyer, E. Landing
- Geology, Environmental Science
- 10 June 2004
Similarities in biotic successions support a unified, composite chronostratigraphy for the Lower-Middle Cambrian of the Iberian and Moroccan margins of West Gondwana. The Cordubian Series (emended…
Palaeogeographical controls on the Cambrian trilobite immigration and evolutionary patterns reported in the western Gondwana margin
- J. J. Álvaro, Olaf Elicki, G. Geyer, A. Rushton, J. Shergold
- Geography, Environmental Science
- 5 June 2003
Cambrian Evolutionary Radiation: Context, correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept
- E. Landing, G. Geyer, M. Brasier, S. Bowring
- Environmental Science, Geography
- 1 August 2013
MIDDLE CAMBRIAN OF AVALONIAN MASSACHUSETTS: STRATIGRAPHY AND CORRELATION OF THE BRAINTREE TRILOBITES
- G. Geyer, E. Landing
- Geography, Environmental ScienceJournal of Paleontology
- 1 January 2001
Abstract Although Middle Cambrian trilobites of the Braintree Member in eastern Massachusetts were among the first published on in North America, re-examination of this fauna has led to wholesale…
New high‐resolution age data from the Ediacaran–Cambrian boundary indicate rapid, ecologically driven onset of the Cambrian explosion
- U. Linnemann, M. Ovtcharova, Jeff Smith
- Environmental Science, GeographyTerra Nova
- 21 December 2018
The replacement of the late Precambrian Ediacaran biota by morphologically disparate animals at the beginning of the Phanerozoic was a key event in the history of life on Earth, the mechanisms and…
Global standard names for the Lowermost Cambrian Series and Stage
- E. Landing, S. Peng, L. Babcock, G. Geyer, M. Moczydlowska-Vidal
- Geology, Environmental Science
- 1 December 2007
The GSSP marking the base of the Cambrian System was ratified by the IUGS in 1992. Ratification of the GSSP point at the base of the Trichophycus pedum Ichnozone in the Fortune Head section, eastern…
Intercontinental, trilobite-based correlation of the Moroccan early Middle Cambrian
- G. Geyer
- Geology
- 1 April 1998
Refined correlations of Lower-Middle Cambrian boundary strata and Middle Cambrian strata between Cambrian paleocontinents require an improved understanding of local stratigraphic ranges of…
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