Abstract
Detailed examination of the Old Red Sandstone succession, which is unconformably overlain by Triassic Dolomitic Conglomerate, has permitted subdivision into twelve formations. The Lower Old Red Sandstone comprises cross-bedded sandstones but the younger rocks are more diversified and may be separated into conglomerate, sandstone and siltstone units. The Lower and Upper Old Red Sandstone contact is a conspicuous disconformity. The beds above and below the disconformable surface display layers of well-developed cornstone, which are interpreted as ancient caliche deposits. Cross-bedding studies show that the Old Red Sandstone sediments were mainly derived from the north-west.
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