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You are browsing the archive for 2012 July 24.

24 July 2012

Tool casts from the Sulphur Mountain Formation of the Spray River Group, Banff

Yesterday I showed you salt casts; today I’ll share a different kind of cast: the infillings of small scorings in the sediment made by tumbling pebbles or sticks or other “tools,”tumbling down a current. These small gouges were later infilled from above by a younger deposit of sediment (frequently coarser in grain size). You’re looking at the bottom of a bed here: These are strata of the Sulphur Mountain Formation, …

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