Evidence of the Clovis Age Comet at Sheriden Cave, Ohio
Ken Tankersley (Anthropology Department, University of Cincinnati, Cincinnati, Ohio, USA)
2009 Midwest Chapter of the Friends of Mineralogy Symposium and Field Conference (Geology Department of Miami University, Oxford, Ohio, USA)
5 September 2009
Sheriden Cave is in Wyandot County, Ohio, near Carey.
The Sheriden Cave area is a flat, featureless landscape that has experienced severe glaciation.
Prior to the mid-1980s, there were no caves in this area.
In summer 1988, Ohio was in severe drought but one area in Wyandot County remained green - a circular area. A sinkhole/cave and sediments acted as a wick - water was drawn upward and kept the grass green. The property owner used a clam bucket to dig - found Sheriden Cave. All Wyandot County caves are sediment-filled.
The Sheriden Pit is a sediment-filled sinkhole leading to a cave.
Inside, a plethora of extinct fauna was found - >70 species of animals and plants. Lots of records at this site. Also found a flakestone artifact - no one cared, though.
There are many caves like this south of the Mason-Dixon Line, but very few north of that.
Did National Science Foundation (NSF)-funded digging at Sheriden Cave. The bones in the cave were very fresh - they were still greasy - collagen-rich and DNA-rich.
There are other caves around the Sheriden Cave entrance.
Flat-headed peccary remains from Sheriden Cave are the youngest on the planet that have been dated.
There is unambiguous evidence of human activity - bone artifacts, a Clovis point (fluted point).
So, here's an opportunity to test the Clovis Comet Hypothesis at Sheriden Cave, Ohio.
All artifacts were found together in a very small area.
Sheriden Cave now is a pile of dirt from the dug-out cave.
Also found a butchered turtle.
Why humans used the cave - food resources (animals go in & can’t get out), shelter, cache site.
Radiocarbon time does not equal sidereal time. Cosmic rays from supernovas are not constant through time. Ex: 11 ky radiocarbon date = 13 ky actual date)
13 ky = right at Clovis time; Sheriden Cave bone artifacts date to this time.
Found microdiamonds (nannodiamonds) & lonsdaleite & shattered microdiamonds (most are shattered - impact diamonds). These don’t occur below or above the Clovis layer.
Found nanno-sized pyrite (reducing environment).
Found carbon & iron spherules - many with fullerenes.
Diamonds - ~400 ppb, range in size from 0.5 m to 0.5 mm.
Carbon spherules - ~148/kg, range in size from 100 m to 1 mm.
Magnetic spherules - >100/kg, range in size from 20-100 m.
Magnetic grains - 2.5 g/kg, range in size up to ~300 m. Many of these look like micrometeorites.
Glacial diamonds (also gold & sivler) - are found in Late Pleistocene black sands of Ohio. These are terrestrial diamonds - much larger than the microdiamonds/nannodiamonds - they are not lonsdaleite.
All these things (except glacial diamonds) are found in the vicinity of a charcoal layer. The charcoal layer dates to 12.9 ± 0.1 ky. Have burned animals & plants at this time.
The charcoal horizon marks the Late Pleistocene extinction event. Megamammals disappear after this.
Well, at Sheriden Cave, only 2 animals go extinct at the charcoal horizon - small animals continued and medium-sized animals mostly go through - they moved north or are still here (Ex: amphibians, fish spp.).
Don’t forget little creatures. Every species of tree there at Clovis time is still here. Every species of reptile alive at the Clovis layer is still around. Only 2 species go extinct at this impact at Sheriden Cave.
Clovis Impact - no extinction, but accelerated climate change.
The charcoal layer from the Clovis Comet is considered to be the marker for the onset of the Younger Dryas.
The Clovis Comet possibly hit in Hudson Bay - there’s an island there with odd geology - a cryptoexplosion structure.
The Cape York Meteorite impact dates to this age.
Some Pleistocene lacustrine deposits have been identified as having a nannodiamond layer.