The Cosmic Tusk

I’ll soon have the actual paper, but below is Sid Perkin’s take at Science Magazine. The news article itself already reveals what appears to be a fundamental misunderstanding of the YDB team’s previous results. The YDB team does not claim the blast spherules are from space. They believe they are terrestrial. The Lake Cuitzeo paper restated this conclusion. (See graphic below). These authors appear to not understand this important aspect of the previous research.

Here is a snippet of write up below. This could well be Sid Perkins’ mistake (who I like), but it looks pretty suspiciously like the author does not know what the other side has been claiming:

…..he notes, the ratios of the concentrations of several rare-earth elements and other trace elements, including iridium, in the spherules embedded in the black mats match those found in Earth’s crust, not in extraterrestrial objects. Rather than coming from an extraterrestrial impact, the spherules were formed on Earth and then trapped in the ancient wetlands by natural processes, the team concludes. The dense spherules then sank to the base of the mat because they’re heavier than other windblown dust, sand, and silt. The chemical composition and location of the spherules, as well as their presence in black mats of many different ages, are more easily explained by natural processes than by extraterrestrial impacts, the team contends.

With the exception of one brief mention as a possibilty in 2007 paper I believe, the magnetic and silicate materials spherules have been ruled out as ET by the home team comet crowd. So then a major paper agrees — and it is news? People are misssing something here.

The YDB team thinks these things are from earth — somehow. This gets misreported, literally, ALL of the time. I have never seen it correctly reported, in fact.  It is too much fun to talk about rains of cosmic material, even if no one claims it. But other publishing researchers should not

As for their central hypothesis, it is intriguing and obviously of merit. Wetlands are indeed a store and sum of the temporal environment. What interests me is the kind of spherules found, and to what degree they were distinguished and characterized. From what Firestone says it looks like they used an optical microscope!?. But I am getting waaaay out ahead of myself…..stay tuned….

No Love for Comet Wipeout

by Sid Perkins on 23 April 2012, 3:05 PM

 

Did a comet wipe out woolly mammoths and an ancient Indian culture almost 13,000 years ago? Geologists have fiercely debated the topic since 2007. Now a new study says an extraterrestrial impact wasn’t to blame, though the scientists who originally proposed the impact idea still aren’t convinced.

Three unexplained phenomena happened on Earth around 12,900 years ago. An extended cold spell known as the Younger Dryas cooled the world for 1300 years. Large creatures such as mammoths, mastodons, and their predators went extinct. And the Clovis culture—a group defined by the distinctive stone and bone tools that they manufactured, and presumed by many archaeologists to be the first inhabitants of the New World—suddenly disappeared.

In 2007, a team of researchers tried to tie together these seemingly disparate events to a single cause: an extraterrestrial object, possibly a comet, exploded above eastern Canada, they speculated. Their claimed evidence, which has been much disputed since it was first reported, included several types of “impact markers” sometimes found after an extraterrestrial object strikes Earth. These purported markers include unusual grains of a titanium-rich form of the mineral magnetite; tiny magnetic spherules; and elevated levels of iridium, a relatively rare element that’s more common in extraterrestrial objects than in Earth’s crust. The researchers found all of these markers embedded within unusual layers of dark, organic-rich sediments that scientists often call “black mats.” These strata are the remains of ancient marshes and swamps, and at many sites across North America, especially in the American Southwest, black mats began accumulating at the beginning of the Younger Dryas, the researchers noted. Many paleontologists have noted that black mats are often a sort of dividing line between older sediments containing fossils of ice-age megafauna, and younger sediments that don’t. And many archaeologists have observed that black mats seem to mark the demise of the Clovis culture, because the distinctive spear points that they produced are common in sediments below the layers but nonexistent above.

Continue reading Breaking: New PNAS Study Claims Black Mat Blast Materials Common To Wetlands