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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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The Scottish Dalradian, which ranges in age from late Precambrian to about Middle Cambrian, consists of two separate successions, the Ballappel and the Iltay. Most of the Ballappel and the lower part of the Iltay succession show orthoquartzite facies, indicating shallow-water marine conditions; a few black slate units imply "euxinic" conditions. Unlike the Ballappel, the Iltay succession includes an upper part of turbidite facies, as is shown by graded grits, volcanic rocks, and shale. Notable for long-distance correlation is the Portaskaig-Schiehallion Boulder Bed, a late Precambrian tillite.
Polyphase orogeny probably occurred in Sardic (Late Cambrian) time, although radiometric evidence suggests thermal activity as late as Silurian or even Devonian time. Whether elevated temperatures were maintained in the Dalradian rocks for this period of more than 100 m.y. is not clear.
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