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Rock 366 : Day 34 : Cone-in-Cone

Day 34 : This is a cone-in-cone structure.  The origin of these is somewhat mysterious, with the consensus appearing to be that they form during early diagenesis by expansive mineral growth.  This is from the Triassic near Market Drayton, Shropshire. Keele collection.

Rock 366 : Day 32 : Sheared Burrows

Day 32 : This is the ‘pipe rock’ or more formally the Pipe Rock Member of the Lower Cambrian age Eriboll Formation. It is a quartz arenite with characteristic skolithos burrows. This sample comes from the western slopes of Cnoc Charornaidh, southeast of Loch Borralan, just beneath the Moine Thrust. …