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John has 41 years of experience in the fields of X-ray Fluorescence/X-ray Diffraction Analyses as Applications Scientist, Laboratory Manager, Product Manager, Marketing Manager and President for Applied Research Laboratories, Bruker AXS, and Claisse USA.

He's been a faculty member of the SUNYA/ICDD XRF Clinics for 25 years.

The proposed North American space rock linked with the Clovis demise is estimated to have been closer to 2.5 miles (4 kilometers) across.

"The physics doesn't support the idea of something that big exploding in the air," he said, noting that the original research team doesn't provide any explanation or models for how such a breakup might occur.

If a 2.5-mile comet had broken into pieces, it could have made a million Meteor Craters, he added.

John's publishing accomplishments include the first explicit procedure for ASTM C-114 Qualification of Cement by XRF, and, "…Such an explosion occurred in Siberia in the early 20th century; the explosive energy of the so-called Tunguska event was more than 1,000 times more powerful than the atomic bomb dropped on Hiroshima."No crater was formed at Tunguska, or the recent Russian impact," Firestone said. The object responsible for the Tunguska event was very small, about 130 to 160 feet (40 to 50 meters) wide, while the recent explosion over Russia was smaller, about 56 feet (17 meters)."There are other processes that potentially could have formed them." Speaking of the black mat found in central Mexico, Firestone said, "Boslough is correct that there are other black mats, but these are dated to 12,900 years ago at the time of impact." He points to independent research published this fall that located hundreds to thousands of samples.However, radiocarbon dating of one of the sites in Gainey, Mich., suggested its samples were contaminated.

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Melted rock formations and microscopic diamonds found in a lake in Central Mexico last year were also suggested as evidence for the collision, but Boslough's team disagrees with the age of the sediment layer in the region.

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