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K/T '3-meter gap' controversy



From: Ben Creisler
bcreisler@gmail.com


A new online paper:

A.J. (Tom) van Loon (2012)
Time and space in stratigraphy: The ‘3-m gap’ story.
Proceedings of the Geologists' Association (advance online publication)
http://dx.doi.org/10.1016/j.pgeola.2012.03.008
http://www.sciencedirect.com/science/article/pii/S0016787812000296


Even for earth scientists it appears difficult to keep in mind that a
sedimentary succession does not form due to accumulation at a constant
rate, but that long periods of slow accumulation may alternate with
short phases of event sedimentation and/or shorter or longer
time-spans of non-deposition or even erosion. An example of this
incorrect way of thinking is a recently published article in which it
is postulated that the find of a ceratopsian brow horn only 13 cm
below the K/T boundary in the Hell Creek Formation (Montana, USA)
proves that dinosaurs did not become extinct before the K/T impact. It
is argued why the postulated consequence (closure of the so-called 3-m
gap: a zone of some metres thick underneath the K/T boundary in which,
thus far, no dinosaur remnants had been found in the USA) is based on
incorrect presumptions, particularly the relationship between time and
space.