New occurrence of Ostracodes used as indications of paleoecology and age for Scots Bay Formation, Bay of Fundy, Canada

Abstract

Fossils in the Jurassic Scots Bay Formation are rare but silicified, species
include ostracodes, small gastropods, small clams, fragments of charophyte stems, and
freshwater stromatolites. The silicified ostracodes and algae are found in thin to thick
beds of mixed carbonate and siliciclastic units deposited in erosional paleotopographic
lows on the top of the Early Jurassic North Mountain Basalt (NMB).
Ostracodes are the most common type of fossil in the Scots Bay Formation, in this
study nearly 800 specimens have been extracted. These ostracodes are moderately to
well preserved, thin-shelled, and occur as whole silicified carapaces, separated valves,
and internal molds. Three ostracodes genera have been identified: Darwinula, Timiriasevia, and Metacypris. Determining the exact age for this Formation has been a matter of mild dispute. The
recorded new occurrence of these ostracodes assemblage will help to revise age and
provide enough knowledge about paleoecology of Scots Bay Formation.