01900nas a2200181 4500008004100000245010500041210006900146300001200215490000700227520130800234653002001542653002101562653002001583653001501603100001401618700001601632856007001648 2001 eng d00aMiddle Cambrian of Avalonian Massachusetts: Stratigraphy and Correlation of the Braintree Trilobites0 aMiddle Cambrian of Avalonian Massachusetts Stratigraphy and Corr a116-1350 v753 a

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 taxonomic and biostratigraphic re-evaluation. This low diversity fauna now includes at least seven species, with the first report of agnostoids (three poorly preserved taxa) and the ellipsocephalid Kingaspis avalonensis new species. Paradoxides (Acadoparadoxides) harlani Green emend., a senior synonym of P. (A.) haywardi Raymond, allows correlation into the lowest Middle Cambrian elsewhere in Avalon. However, all the polymeroid species are endemic, and this precludes a highly resolved correlation into other Cambrian paleocontinents. A breakdown of provincial barriers in the late Early Cambrian as western Gondwana passed from equatorial to the higher south latitudes of Avalon led to faunal exchanges between these continents. Paradoxides (Acadoparadoxides) and Kingaspis of the Braintree fauna are shared with western Gondwana, while Braintreella and “Agraulos quadrangularis are closest to genera known from the Spanish, Moroccan, and Perunican (Bohemian) margins of Gondwana.

10aBiostratigraphy10aBraintree Member10aMiddle Cambrian10atrilobites1 aGeyer, G.1 aLanding, E. uhttp://dx.doi.org/10.1666/0022-3360(2001)075<0116:MCOAMS>2.0.CO;2