Deep sea drilling project site 612 bolide event; new evidence of a late Eocene impact-wave deposit and a possible impact site, U.S. east coast: comment and reply

Article Abstract:

A comment and reply on the data found by the deep sea drilling project site 612 bolide event is presented. The data proposes a late Eocene impact-deposit and a possible impact site in the US east coast. The comment proposes two separate impact events to explain the data. The reply uses biostratigraphic measurements to reanalyze the data. Preliminary findings reveal a single impact event. The object that impacted had several layers which explains the different material found at the site. The composition of the object is much more complicated than was presupposed.

Models, Geological research, Geology, Stratigraphic, Stratigraphy, Marine sediments, Eocene Epoch

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Surface expression of the Chicxulub crater: comment and reply

Article Abstract:

K.O. Pope et al. have presented an interesting and significant new high-resolution topographic data set for the Chicxulub crater based on gravity records but have made the wrong conclusions. The problem is about the size of the buried Chicxulub impact basin. The cenote ring is expressed by a discontinuous moat averaging 3 to 6 m below the surrounding surface. The question is why Pope et al. selected this feature as the most prominent while the broad concentric ridge in the middle of the outer gravity ring is a better choice.

Natural history, Yucatan, Mexico

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Using fossil leaves as paleoprecipitation indicators: an Eocene example: comment and reply

Article Abstract:

Peter Wilf and associates conducted a research on leaf sizes in modern vegetation and found that leaf sizes accurately predicted mean annual precipitation. The methods used by the researchers, however, are questionable since the leaf samples used to derive size were not comparable to one another. They also ignored the effect of temperature on leaf size. A test on the procedure used showed that it cannot validly delimit the largest or smallest leaf sizes in every species.

Precipitation (Meteorology), Leaves, Fossil, Fossil leaves, Wilf, Peter

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