Chamberlain's Brook Formation

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Chamberlain's Brook Formation
Stratigraphic range: 509–506 Ma (Middle Cambrian)
Type Formation
Unit of Adeyton Group[1]
Sub-units Fossil Brook Member (and others)
Underlies Manuels River Formation (unconformably?)[2]
Thickness up to 14 m[2]
Primary Green, purple and red siliciclastic marine mudstones[2]
Region Atlantic coast

 United States

Chamberlains Brook Formation map.svg
Occurrence of the Chamberlain's Brook Formation in southeastern Newfoundland

The Chamberlain's Brook Formation is a thin but distinctive geologic formation of dark red calcareous mudstones[3] that crops out from Rhode Island to Massachusetts and, Nova Scotia, New Brunswick and Newfoundland.[2] It preserves fossils, including trilobites, dating back to the lower mid-Cambrian period.[2] Its lowermost member is the Braintree Member (lowest Middle Cambrian) and the uppermost member is the Fossil Brook Member.[2]

See also[edit]


  1. ^ Terrence Patrick Fletcher (2006). Bedrock Geology of the Cap St. Mary's Peninsula. Southwest Avalon Peninsula, Newfoundland (PDF). St. John's Newfoundland: Department of Natural Resources Geological Survey Newfoundland Labrador. ISBN 1-55146-031-9. 
  2. ^ a b c d e f Kim, Dong HEE; Westrop, Stephen R.; Landing, ED (2002). "Middle Cambrian (Acadian Series) Conocoryphid and Paradoxidid Trilobites from the Upper Chamberlain's Brook Formation, Newfoundland and New Brunswick". Journal of Paleontology. 76 (5): 822. doi:10.1666/0022-3360(2002)076<0822:MCASCA>2.0.CO;2. 
  3. ^ Normore, L. S. 2012: GEOLOGY OF THE RANDOM ISLAND MAP AREA (Nts 2C/04), Newfoundland. Current Research (2012) Newfoundland and Labrador Department of Natural Resources Geological Survey Report 12-:121–145.