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Veryhachium is an acritarch genus that occurs commonly in marine shales from the Ordovician to the Tertiary, with morphologically closely related forms appearing in the Cambrian. Its simple morphology together with its long stratigraphic range and abundance makes it attractive as a potential thermal maturity indicator. The colour of Veryhachium is characterised in terms of red, green and blue intensity of transmitted white light. With increasing thermal maturity, Veryhachium changes from almost colourless to black, with the most rapid change taking place in rocks that are marginally postmature with respect to the oil window. The cutoff point for Veryhachium fluorescence lies between 1.5% and 2.0% in terms of vitrinite reflectance (Rr), providing another useful tie-point in terms of thermal maturity. This technique is simple, inexpensive and has potential for establishing the thermal maturity of both marine Lower Palaeozoic rocks and younger marine sections deficient in vitrinite.

Colour change in the acritarch Veryhachium as an indicator of thermal maturity