1973  Waterhouse, p.314: Several localities spaced over a
distance of 24 km on both limbs of the Nelson Regional Syncline.
Greville Fm. comprises turbidites and laminintes, 1200 m to 5000
mthick, deposited very rapidly. The ammonoids are generally found
in calcareous concretions in laminites 0.2 mm to 0.8 mm thick, or
in mudstone (GS 10263, 11132, in coarse turbidite GS 10526).