The Laidlaw Volcanics: a Late Silurian point on the geological time scale

Details The Laidlaw Volcanics: a Late Silurian point on the geological time scale The Laidlaw Volcanics: a Late Silurian point on the geological time scale

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..59...90w&link_type=abstract

Earth and Planetary Science Letters, Volume 59, Issue 1, p. 90-100.

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Scientific paper

Mapping, mineralogical and chemical studies of an area west and northwest of Canberra, southeastern Australia, have shown that the Laidlaw Volcanics are unique in the region, and that their age is tightly controlled stratigraphically as they lie both above and below Early Ludlow (Late Silurian) fossiliferous sediments.
K-Ar mineral analyses, previously published Rb-Sr mineral analyses, and new Rb-Sr whole rock and mineral analyses together give the Laidlaw Volcanics an age of 420.7+/-2.2 m.y. This result for the Early Ludlow is identical numerically with a recently published age of 421+/-3 m.y. for the Ashgilian (Late Ordovician) Stockdale Rhyolite, and suggests either that the time interval between the Ashgill and Ludlow does not exceed a few million years or that the age estimate for the Stockdale Rhyolite is too young.

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