By Hassan S H
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Extra info for Sedimentology & paleontology of the Jurassic Scots bay formation of Nova Scotia
Example text
Stratigraphie section of the Scots Bay Formation at Davidson Cove. Brown feldspathic litharaïte with Lthoclasts Sandy pdoidal Iimesbne Chert and partly dicified peloidal limeStone Calcareous sandstone, stromatolitic Bioturbated silty, sandy silicified limestone with laminations, burrows, ostracodes,and chert Bioclastic silty sandy silicified Iimestone with basaltic clasts, ostracodes, bivdves, and gastropods Argillaceous silty sandstone, buzroW8d, bioturbation, larninations, chert, basaltic clasts North Mountain Basalt Figure 4-4.
In fluvial channel and point bar deposits, the lowest bed is coarse-grained sandstone that may contain basal pebble lag deposits, the basal contact is sharp, and sandstones becorne thin-bedded and finer grained upward (Pettijohn 1975). This facies is interpreted as a channel-fil1 deposit that may have been associated with a meandenng Stream. 3 OFFSHORE FACIES This facies is represented by a silty sandstone unit that occurs at the base of most sections. Klein ( 1962) describeci these basal beds as green and purple claystone overlain by t hin-bedded greenish-gray fine-grained limestone.
Fragrnented ostracodes are cornmon. This unit may represent a shallow environment over which a slight transgression may have caused relatively deeper conditions to develop in cornpanson to the laminated unit beIow. The distribution of the peloids seems to be related to the stromatolites and calcareous algae in that they occur within and below the stromatolitic unit. The peloids, by virtue of occurring in stromatolitic crusts, are interpreted as probable rnicrobiai products (Sun and Wright, 1989).