Ammonite indicates Cretaceous age for part of Franciscan group in San Francisco Bay area, California
Schlocker, Julius ; Bonilla, Manuel George ; Imlay, Ralph Willard
AAPG bulletin, 1954-11, Vol.38 (11), p.2372-2381 [Periódico revisado por pares]American Association of Petroleum Geologists
Texto completo disponível