Some very fine examples of flute casts in the Praia da Amoreira turbidites. Scour marks and flute casts are scours dug into soft, fine sediment, particularly turbidites as in this case, which typically get filled by an overlying bed (hence the name cast). Measuring the long axis of the flute cast gives the direction of flow, with the tapered end pointing toward the flow and the steep end up current. The concavity of the flute cast also points stratigraphically up. Flute casts can be characterized into four types, parabolic, spindle-shaped, comet-shaped, and asymmetrical. These particular examples are generally parabolic. πββπ΅πΉ #geology #geologypage
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#turbidites #shale #limestone #marl #beach #sea #sand #flutecast #scourmark #loadcast #structuralgeology #surf #shore #havaianas #wayupcriteria #Carboniferous #praiadaamoreira #algarve #portugal #costavicentina #magmageological
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