Formal Subdivision of the Holocene Series/Epoch

Formal Subdivision of the Holocene Series/Epoch

Formal subdivision of the Holocene Series/Epoch It has been announced that the proposals for the subdivision of the Holocene Series/Epoch (11 700 years ago to the present day) into three stages/ages and their corresponding subseries/subepochs by the International Subcommission on Quaternary Stratigraphy (ISQS) (a subcommission of the International Commission on Stratigraphy – ICS) have been ratified unanimously by the International Union of Geological Sciences (IUGS). The subdivisions now formally defined are: 1. Greenlandian Stage/Age = Lower/Early Holocene Subseries/Subepoch Boundary Stratotype (GSSP): NorthGRIP2 ice core, Greenland (coincident with the Holocene Series/Epoch GSSP, ratified 2008). Age: 11,700 yr b2k (before AD 2000). 2. Northgrippian Stage/Age = Middle/Mid-Holocene Subseries/Subepoch Boundary Stratotype (GSSP): NorthGRIP1 ice core, Greenland. Global AuXiliary Stratotype: Gruta do Padre Cave speleothem, Brazil. Age: 8326 yr b2k. 3. Meghalayan Stage/Age = Upper/Late Holocene Subseries/Subepoch Boundary stratotype (GSSP): Mawmluh Cave speleothem, Meghalaya, India. Global AuXiliary Stratotype, Mount Logan ice core, Canada. Age: 4250 yr b2k. These divisions are now each defined by Global Stratotype Sections and Points (GSSPs), which means that they are fiXed in time in sedimentary sequences. The terms Greenlandian Stage/Age, Northgrippian Stage/Age, Meghalayan Stage/Age, Lower/Early Holocene Subseries/Subepoch, Middle/Mid-Holocene Subseries/Subepoch and Late/Upper Holocene Subseries/Subepoch therefore have formal definitions and boundaries. These definitions represent the first formal geological subdivision of the Holocene Series/Epoch, resulting from over a decade of labour by members of the joint ISQS (International Subcommission on Quaternary Stratigraphy) - INTIMATE Members Working Group (Integration of Ice-core, Marine and Terrestrial Records), led by Professor Mike Walker (University of Aberystwyth). Phil Gibbard Secretary General ICS Cambridge 26.6.18 .

View Full Text

Details

  • File Type
    pdf
  • Upload Time
    -
  • Content Languages
    English
  • Upload User
    Anonymous/Not logged-in
  • File Pages
    1 Page
  • File Size
    -

Download

Channel Download Status
Express Download Enable

Copyright

We respect the copyrights and intellectual property rights of all users. All uploaded documents are either original works of the uploader or authorized works of the rightful owners.

  • Not to be reproduced or distributed without explicit permission.
  • Not used for commercial purposes outside of approved use cases.
  • Not used to infringe on the rights of the original creators.
  • If you believe any content infringes your copyright, please contact us immediately.

Support

For help with questions, suggestions, or problems, please contact us