Shaunavon Formation, Stratigraphic formation in Saskatchewan, Canada
The Shaunavon Formation is a rock layer in southwestern Saskatchewan composed of two distinct members of limestone and calcareous sandstone. The formation extends across the region and was originally identified and named in the mid-20th century based on geological study.
Geologists first documented this rock layer in 1954 and named it after the nearby town of Shaunavon. The formation later became economically important due to significant oil deposits that made it a valuable resource for the region.
The rock layers contain fossil remnants from an ancient inland sea that covered this region during the Cretaceous period, offering visitors a window into a vanished ecosystem. These traces help people understand the environmental conditions that once shaped Saskatchewan's landscape.
The formation is located underground and cannot be viewed directly from the surface, but its presence influences the landscape of southwestern Saskatchewan. Those interested in geology can visit rock outcrops and exposed layers in quarries and road cuts in the region.
The upper rock layers contain multiple sedimentation breaks and lens-shaped formations that reveal changes in the environment where sediments were originally laid down. These interruptions in deposition tell the story of shifting conditions that occurred over long spans of time.
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