Geology : Carneys Creek to Forbes River, Upper Rangitata Valley.

Frankham, T. M.

An area of Torlesse Supergroup rocks lying between the Forbes River and Carneys Creek, tributaries of the Havelock River, Upper Rangitata Valley, are mapped and described. A thick massive siltstone unit in upper Carneys Creek and Murphy Stream yields a Kaihikuan (Middle Triassic) fauna and is proposed as a new formation, the Carneys Creek Siltstone. This siltstone may be as much as 1.5 kilometres thick.
The other undifferentiated Torlesse Supergroup rocks consist mainly of massive, indurated, moderately to p&ly sorted fine feldsarenite sands, witi1 interbedded fine siltstone bands. Metamorphism to prehnite-pumpellyite metagreyv1acke facies has been experienced. Regional strike is approximately northeast/southwest, with a vertical dip •. Younging directions are obtained from graded bed sequences and cross laminated sediment, and indicate possible isoclinal folding. Faulting is recognised within the area.

54 leaves : maps (1 in pocket) , plates ; 24 1/2 cm.

1972Frankham

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