Mathematics – Logic
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..439r&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 439-440 (SEE N87-23341 16-91)
Mathematics
Logic
Ejecta, Geomorphology, Impact, Meteorites, Paleontology, Sedimentary Rocks, Geological Surveys, Hydrogeology, Petrography, Spherules, Stratigraphy
Scientific paper
Nodule-like objects which the author believes to be impact bombs had been found in Middle Ordovician rocks of southeastern Wisconsin and northern Illinois. In northern Illinois, rock fragments containing oolith-like spherules, which the author believes to be solidified impact droplets, and numerous large bubble-holes, had been found at the same stratigraphic level. The discovery of bomb-like nodules in Lower Ordovician rocks of southeastern Wisconsin was reported. Bomb-type nodules associated with droplet-type spherules have been found in Lower Ordovician rocks of central Pennsylvania. These discoveries, in the authors opinion, suffice to show that impact ejecta are widespread in marine sediments of Ordovician age and are likely to be widespread also in marine sediments of other ages. Unfortunately, according to the author, there is little indication so far that this evidence has been accepted as valid by the concerned scientific community.
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