PT  - JOURNAL ARTICLE
AU  - Cowie, J. W.
TI  - The Cambrian period
DP  - 1964 Jan 01
TA  - Geological Society, London, Special Publications
PG  - 255--258
VI  - 1
IP  - 1
4099  - http://sp.lyellcollection.org/content/1/1/255.short
4100  - http://sp.lyellcollection.org/content/1/1/255.full
SO  - Geological Society, London, Special Publications1964 Jan 01; 1
AB  - Fifteen selected radiometric ages are used to construct a time-scale for the Cambrian System. Maximum thicknesses are not considered to be useful in constructing a Cambrian time-scale. Ages of 495 m.y. and 570 m.y. are suggested for the top and base of the system, with ages of 540 m.y. and 515 m.y. for the Lower-Middle and Middle-Upper Cambrian.