Berriasella jacobi is an extinct species of ammonite from the late Jurassic and early Cretaceous. Because of its unique stratigraphic position, it is used... 1 KB (117 words) - 23:01, 15 July 2023 |
 | compressed, the venter more or less narrowly rounded. The species Berriasella jacobi traditionally has been regarded an index fossil defining the base... 6 KB (325 words) - 01:33, 24 November 2023 |
 | the first appearance of the ammonite Strambergella jacobi, formerly placed in the genus Berriasella, but its use as a stratigraphic indicator has been... 91 KB (9,487 words) - 16:56, 16 April 2024 |
placed at the first appearance of fossils of the ammonite species Berriasella jacobi. But this is a species that has a stratigraphically problematic and... 7 KB (651 words) - 20:07, 14 March 2023 |
 | the first appearance of the ammonite Strambergella jacobi, formerly placed in the genus Berriasella, but its use as a stratigraphic indicator has been... 228 KB (24,670 words) - 18:46, 18 April 2024 |
Magnetic—base of Chron M18r Base of Calpionellid zone B FAD of Ammonite Berriasella jacobi Lower boundary GSSP candidate section(s) None Upper boundary definition... 14 KB (1,218 words) - 13:29, 25 February 2024 |
definition candidates Magnetic—base of Chron M18r Base of Calpionellid zone B FAD of Ammonite Berriasella jacobi Upper boundary GSSP candidate section(s) None... 8 KB (602 words) - 13:14, 28 February 2024 |
definition candidates Magnetic—base of Chron M18r Base of Calpionellid zone B FAD of Ammonite Berriasella jacobi Upper boundary GSSP candidate section(s) None... 33 KB (3,256 words) - 09:25, 15 January 2024 |
Thurmanniceras sp. Valanginian Murca Fm. Ubalá Labranzagrande Cundinamarca Boyacá Berriasella colombiana, Leptoceras ublanese n. sp., Pseudoosterella ubalaensis Berriasian... 156 KB (6,016 words) - 21:33, 23 August 2023 |