• Thumbnail for Ordovician
    GSSP ratified 2000 Upper boundary definition FAD of the Graptolite Akidograptus ascensus Upper boundary GSSP Dob's Linn, Moffat, U.K. 55°26′24″N 3°16′12″W...
    69 KB (7,298 words) - 05:51, 18 March 2024
  • Thumbnail for Silurian
    formality Formal Lower boundary definition FAD of the Graptolite Akidograptus ascensus Lower boundary GSSP Dob's Linn, Moffat, United Kingdom 55°26′24″N...
    57 KB (5,666 words) - 09:06, 22 April 2024
  • was originally defined as the first appearance of the graptolite Akidograptus ascensus at Dob's Linn, but was later discovered to be imprecise. It is currently...
    14 KB (1,245 words) - 20:04, 5 November 2023
  • formality Formal Lower boundary definition FAD of the graptolite Akidograptus ascensus Lower boundary GSSP Dob's Linn, Moffat, U.K. 55°26′24″N 3°16′12″W...
    5 KB (340 words) - 22:01, 5 October 2021
  • 2006 Upper boundary definition First appearance of the graptolite Akidograptus ascensus Upper boundary GSSP Dob's Linn, Moffat, U.K. 55°26′24″N 3°16′12″W...
    18 KB (2,065 words) - 08:10, 10 January 2024
  • Moffat, Dumfries-shire, Scotland, U.K. Biologic: First appearance of Akidograptus ascensus and Parakidograptus acuminatus (Graptolite). 1.6 m above the base...
    92 KB (3,982 words) - 15:30, 16 April 2024
  • Thumbnail for Dob's Linn
    the first appearance of graptolites Parakidograptus acuminatus and Akidograptus ascensu 1.6 m above the base of the Birkhill Shale Formation. The shale section...
    7 KB (670 words) - 10:25, 8 April 2022