Before present

BP, before present (z ang., przed teraźniejszością) – system oznaczania lat, stosowany w geologii[1] i archeologii do oznaczania wydarzeń z przeszłości. Za „teraźniejszość” przyjęty został rok 1950, ze względu na rozwój datowania radiowęglowego od lat 50. XX wieku.

Przykład

  • 12000 BP oznacza, że dane wydarzenie miało miejsce 12000 lat przed rokiem 1950.
  • 12000 BP = 10050 r. p.n.e.
  • 2000 BP = 50 r. p.n.e.
  • 500 BP = 1450 r. n.e.

Przedrostki SI

Dla wydarzeń dawnych, stosowane są przedrostki wielokrotności układu SI, najczęściej:

Np.

  • 40 ka BP = 40 tysięcy lat temu (tj. przed rokiem 1950, lecz przy takiej skali i dokładności określenia czasu, różnica ostatnich kilkudziesięciu lat nie ma na ogół większego znaczenia)

Zobacz też

Przypisy

  1. ↑ por. np. Mike Walker i inni. Formal definition and dating of the GSSP (Global Stratotype Section and Point) for the base of the Holocene using the Greenland NGRIP ice core, and selected auxiliary records. „Journal of Quaternary Science”. 1 (24), s. 3-17, 2009. [dostęp 2009-08-15]. 
  2. ↑ Martin Kölling, Numerous ways to say "thousand years" in a scientific paper, [w:] Marine Geochemistry - Laboratory Methods [online], Universität Bremen, 2015 [dostęp 2023-03-24] (ang.).

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