Pre-hawera geology of the Kaka District, North-West Nelson

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Abstract
In the Kaka District the Cretaceous Separation Point Granite is unconformably overlain by Lower Tertiary sediments belonging to the Westhaven Group which is divided into four formations. The oldest formation, Motupipi, consisting of coal measures overlain by marine sands, is conformably overlain by algal limestone and sandstone of the Huia Formation. The Huia Formation is conformably overlain by massive fine-grained sediments of the Sherry River Formation which encloses a sequence of graded beds in the north, mapped as the Burmeister Formation. The contact of Lower Tertiary sediments and granite is depositional in the south, but in the north it is faulted along the Matariki Fault Zone. Faulting was preceded by folding of the Tertiary beds into two north-north-east trending folds, the Hope Anticline to the west and the Sherry Syncline to the east. Both the granite and Lower Tertiary rocks are unconformably overlain by non-marine beds belonging to the Tadmor Group. The Tadmor Group consists of the Upper Tertiary Glenhope Formation and the conformably overlying Lower Pleistocene Moutere Gravel. In the valleys a sequence of Upper Pleistocene aggradational gravels were deposited.

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