A visit to the Precambrian-Cambrian boundary
Sandra
Barr recently had an opportunity to visit the
internationally recognized "global stratotype" (type section) for the
Precambrian-Cambrian boundary at Fortune Head, Newfoundland. In
the photograph her left hand is on the boundary (age 542 million years).
This site was selected because sediment deposition was continuous across
the boundary at this location. Evidence of abundant life on the sea
floor in
the form of trace fossils begins about 2 metres (a few million years)
above
this boundary in the Early Cambrian. The
field trip was organized by the Newfoundland Section of the Geological
Association of Canada.