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Re: Big Craters
Jerry D. Harris <LOKICORP@compuserve.com> wrote
>NAME OF CRATER: Morokweng
>LOCATION: southern Africa
>AGE: at or very near Jurassic-Cretaceous boundary (with which no mass
>extinctions are associated)
>CRITERIA ON WHICH IT IS BASED: mostly seismic and gravity anomaly (crater
>is subsurface), but also petrologic and geochemical
>SIZE OF CRATER: 340 km (~154 miles) diameter
>Koeberl, C., Armstrong, R.A., and Reimold, W.U. 1997. Morokweng, South
>Africa: a large impact structure of Jurassic-Cretaceous boundary age.
>_Geology_ 25(8): 731-734.
>Corner, B., Reimold, W.U., Brandt, D., and Koeberl, C. 1997. Morokweng
>impact structure, Northwest Province, South Africa: geophysical imaging
>and shock petrographic studies. _Earth and _Planetary Science Letters_
Size of this crater could be much smaller - estimates vary from 70 to 340 km.
McKinnon W B, Extreme Cratering, Science 1997; 276:1346-48
Gautam Majumdar email@example.com
- Big Craters
- From: "Jerry D. Harris" <LOKICORP@compuserve.com>