01847nas a2200193 4500008004100000245015500041210006900196300001200265490000700277520115200284653002001436653002301456653001201479653004001491100001601531700002001547700001601567856007001583 2002 eng d00aMiddle Cambrian (Acadian Series) Conocorhyphid and Paradoxidid Trilobites from the Upper Chamberlain's Brook Formation, Newfoundland and New Brunswick0 aMiddle Cambrian Acadian Series Conocorhyphid and Paradoxidid Tri a822-8420 v763 a

The Fossil Brook Member of the upper Chamberlain's Brook Formation is a thin (up to 14 m) but distinctive, unconformity-bound depositional sequence recognizable from Rhode Island to eastern Newfoundland in Avalonian North America. Its diverse trilobite fauna was first described more than century ago from the limestone-rich facies of the member in southern New Brunswick. However, the systematics, stratigraphic context, and biostratigraphic significance of these trilobites have remained poorly known. A revision of the conocoryphid and paradoxidid trilobites has been completed, and the taxa set into their stratigraphic context within the middle Middle Cambrian. The faunas of the Fossil Brook are assigned to the Eccaparadoxides eteminicus Zone of Avalon. Although biogeographic barriers between Avalon and Gondwana remained strong in the Middle Cambrian and few shared trilobite species are present, a generalized correlation of the E. eteminicus Zone into Gondwana is with the Badulesia tenera Zone of the Toushamian Stage in Morocco and the Badulesia Zone of the Caesaraugustian Stage in Spain.

10aBiostratigraphy10aFossil Brook Membe10afossils10aupper Chamberlain's Brook Formation1 aKim, D., K.1 aWestrop, S., R.1 aLanding, E. uhttp://dx.doi.org/10.1666/0022-3360(2002)076<0822:MCASCA>2.0.CO;2