Bill, Reubs, & Richard at Albion
Island Quarry, Belize. We'd only been there a short time, and had
already seen wonderful things.
Dr. Kevin Pope poses for scale
below a "jacketed" dolomite boulder about six or seven
meters across. (See next shot down for a brief explanation.)
It now resides in the spherule bed of the impact breccia (ejecta).
Presumably, it's either a ripped up fragment of the underlying Barton
Creek Dolomite, or it's a large clast ejected from the crater itself.
Reuben Johnson (me) posing with
another "jacketed boulder." The boulders in the
ejecta exhibit a definite crust apparently of surrounding material that
seems to have accreted (adhered) onto the boulders at the time they were
being deposited. The jacket on this boulder is indicated by my
thumb and finger. (There is some distortion due to parallax.)
The group discusses the strange
nature of the boulders and various theories behind their origin.
Albion Island Quarry. An excellent
shot of the K/T Boundary in the quarry's wall. Labels indicate
the formations and their thickness, small arrows indicate the contact at
the top of the Barton Creek Dolomite. Note that this would have
been the land's surface at time of impact, and the wavy nature of the
contact is actually the Tertiary's topography.
Reuben taking notes on the spherule
bed (the bottom-most layer of ejecta) in preparation for analyzing
its magnetic intensity which will later be compared to that of
the underlying Barton Creek Dolomite. The variations in magnetic
signature will be used to map the ejecta.
Just a couple of shots of "slickensides" in the spherule bed. Units in the lower
photo are centimeters. If you're not a geologist, you probably
won't be too interested in viewing these two.
This page was last updated on 07/22/01
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