K2O analyses were performed by flame photometry and Ar mas analyses were done with a multiple collector mass spectrometer. Conventional K-Ar dating techniques as described in Lalrymple and Lamphere (1969).
Summary
K2O analyses were performed by flame photometry and Ar mas analyses were done with a multiple collector mass spectrometer. Conventional K-Ar dating techniques as described in Lalrymple and Lamphere (1969).
The coordinates are represented in North American Datum of 1927 (NAD27). Location was derived from the following method(s): Provided by source document