02599nas a2200217 4500008004100000245012800041210006900169300001200238490000700250520188700257653001802144653002002162653002402182653002602206653001202232653001502244100001602259700001402275700002202289856007002311 2002 eng d00aLatest Early Cambrian Small Shelly Fossils, Trilobites, and Hatch Hill Dysaerobic Interval on the Québec Continental Slope0 aLatest Early Cambrian Small Shelly Fossils Trilobites and Hatch  a287-3050 v763 a

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 turbidite limestones in the Bacchus slice at Ville Guay, Québec. Platform-derived microfaunas of the Bicella bicensis trilobite assemblage were transported into a dysoxic environment of the upper “Anse Maranda Formation,” and many organisms were buried alive. Phosphatization preserved a diverse skeletal fossil assemblage that includes four agnostid trilobites, echinoderm debris, and twenty small shelly fossil taxa. The latter include five helcionellids; Pelagiella Matthew, 1895b, classified herein as a gastropod; a bivalve (FordillaBarrande, 1881); the brachiopod Linnarssonia taconica Walcott, 1887; two conodontomorphs; four hyoliths; and such phosphatic and calcareous problematica as ColeoloidesWalcott, 1889, emend. Most small shelly fossil taxa, including Discinella micansBillings, 1872, range through much of the Olenellus Zone and Elliptocephala asaphoides assemblage interval. Trilobites allow a more resolved correlation into the uppermost Olenellus Zone. A comparable stratigraphy occurs in Cambrian–Ordovician slope facies of the Bacchus slice and the Giddings Brook slice in eastern New York. The “Anse Maranda Formation” correlates with the West Granville–Browns Pond–lower Hatch Hill formations in eastern New York and brackets two dysaerobic intervals (Browns Pond and early Hatch Hill). Sea-level change associated with the Hawke Bay regression between the Browns Pond and Hatch Hill onlap/dysaerobic intervals led to the longest period of oxygenated green shale and sandstone deposition on the east Laurentian slope in the late Early Cambrian–earliest Ordovician.

10aBacchus slice10aBiostratigraphy10aearliest Ordovician10alatest Early Cambrian10aQuébec10aVille Guay1 aLanding, E.1 aGeyer, G.1 aBartowski, K., E. uhttp://dx.doi.org/10.1666/0022-3360(2002)076<0287:LECSSF>2.0.CO;2