Drook Formation
geologic formation In Canada
The Drook Formation is a geologic formation in Newfoundland and Labrador. It preserves fossils dating back to the Ediacaran period which have been dated to 575.8 ± 0.5 million years ago, making them the oldest macroscopic complex fossils in Newfoundland until the discovery of fossils in the pre-Gaskiers glaciation Rocky Harbour Formation and underlying Mall Bay Formation.
Geology
The Drook Formation is predominately composed of well-bedded banded green cherts, silicified siltstones, and argillites. A majority of the chert beds contain the silicified siltstones, and range in thickness from a fraction of an inch to 2 in (51 mm). The base of the formation is not exposed, as such its full thickness is unknown. It can be found outcropping in the Conception Bay area and the Avalon Peninsula.
Paleoenvironment
The depositional environment of the formation was first considered to be that of a shallow-marine environment inferred from the high silica content of the rocks, the abundance of calcareous nodules, as well as large ripple marks covering exposed surfaces.
A later study done in 2003 would suggest that the Drook Formation was deposited on a deep basin-floor, due to the thick bedding and coarser grains found within it, and the evidence of both south-westerly and north-easterly paleocurrents. This was further supported with the study of the Drook Formation in the Conception Bay area confirming that sediments were likely deposited in a deep distal-fan to basin-plain environment, again inferred from the thickness of the various layers, and the discovery of medium-association bedded turbidites.
Dating
Both the base and top of the Drook formation has been dated using U–Pb dating and various zircon crystal samples.
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