[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
multiple bolide impacts
The Deccan Traps flows date from 66 mya. The crater below Mason (?) Iowa
(long since filled in by glacial debris) is also dated to 66 mya. Of course,
the Chixulub crater is dated to 65 mya.
In the geological record, there are numerous multiple impact records,
including three craters in Siberia dating to 2.5-to 2 mya. These may not have
been simultaneous but may have fallen periodically over some 10s or hundreds
of thousands of years.
Could then the K-T boundary be, in reality, a phenomenon that was some one
or two million years in the making or perhaps 10 to hundreds of thousands of
years in the making? Granted the Deccan Traps can be attributed to the
pulling away of the Seychelles from India 66 million years ago, but could
that rift have been triggered by a bolide impact?
And could that impact have coincided witht the Mason Iowa event and
perhaps other smaller impacts?
And could the Chixulub impact be related to all these events? I ask this
in light of the continuing debate over the decline of dinosaur species and
families before the K-T and with the disappearance of many marine reptile
families several million years before the coup de grace.
The Deccan Traps volcanic episode (one of many in the geologic record)
lasted perhaps 100,000 years and may very well have stressed marine and
terrestrial environments to the point that researchers see declines in
families in the fossil record in the latest Mastrichian. The declines would
have leveled off once the volcanism finally subsided, but there was too
little time for family or species rebound before the Chixulub event.
The more information that comes to light about Chiculub, Mason Iowa, and
the Deccan events, the more I suspect multiple extra-terrestrial agents -
perhaps a comet or asteroid "storm" - moving through earth's orbit over the
course of two or three million years.
Does anyone have an opinion on the likelihood of such a senario?
--from the editor of Dinosaurus magazine.