New information on the age and sequence stratigraphy of the type Thanetian of southeast England
O'B. Knox, Robert W.; Hine, Nicolette M.; Ali, Jason R.
published: Apr 12, 1994
ArtNo. ESP026003001006, Price: 29.00 €
The drilling of a cored borehole at Bradwell, Essex, has provided an opportunity to examine an unweathered and almost continuous section through equivalents of the Thanet Formation stratotype sections of northeast Kent. Calcareous nannoplankton and magnetostratigraphic analysis indicate an age range from NP6 (Chron 26N) to NP8 (Chron 25R), similar to that reported from the stratotype sections. However, whereas the base of the type Thanetian has previously been dated only as undifferentiated NP6. NP7, the upward incoming of Sphenolithus anarrhopus in the Bradwell section provides a strong indication that both zones are represented. The association of the basal sediments with Chron 26N confirms that the base of the type Thanetian lies within the upper part of NP6. The relative thinness of the section attributed to NP7 in the Bradwell section appears to result from non-sequence and condensed sedimentation associated with a sequence boundary that occurs near the middle of the formation. This sequence boundary is equated with the base of the Reculver Silts in the stratotype section and with the base of the Lower Landenian in Belgium.