This week on Fossil Friday we have a pair of interestingly textured specimens.
What could they be? Animal, vegetable, or mineral? Okay, most certainly mineral at this point. But what were they originally? They date from the Devonian and were collected in a quarry in North Liberty, Iowa. First person to identify them wins bragging rights for the week!
In “Whence Fact, Theory, and Path?” I was talking about what I described as “a familiar threefold distinction between evolution as fact, evolution as theory, and evolution as path.” It’s a current distinction, with its modern locus classicus T. Ryan Gregory’s “Evolution as Fact, Theory, and Path” (PDF), which appeared in the inaugural issue of Evolution: Education and Outreach in 2008. But it is also a venerable distinction, appearing as far back as the Scopes trial.
Josh Rosenau and I have just returned from NCSE’s annual rafting trip down the Colorado River and through the spectacular geology and biology of Grand Canyon. Our two motorized boats were packed with an eclectic mix of scientists, teachers, NCSE members, and people who wanted the ultimate experience in Grand Canyon in the company of those who love science.
But this year there was a twist.
In part 1, I started to pay a debt to Steve Bowden by writing about sloths. Sloths were once considered part of Edentata, which I regard as the Beatles of Mammalia, along with anteaters and armadillos, pangolins, and aardvarks. (Goofy yet
We returned last week to Germany’s stunning Jurassic Solnhofen limestone. I gave you the somewhat useless hint that I wouldn’t ever eat one of these creatures, let alone their extant relatives. The reason? I do not eat invertebrates. I find them downright terrifying when they are dead and being eaten. Living? No problem. Dead and on ice? Puke-city. I honestly do not know where this aversion/phobia came from, but I’ve had it as long as I can remember.
We’re going back to the Solnhofen this week because I just can’t help bringing you another example of how breathtakingly gorgeous these specimens are. I mean…just look at it! The details! These are 155-million-year old details, people! Nature is amazing.
A while back, on Twitter, the wonderful anthropologist/dog-rescuer @Paleophile and I were talking about our favorite xenarthrans. Hers: sloth. Mine: pink fairy armadillo and two-toed sloth (tie). Then I said:
Can we also talk about how [X]enarthra would be the perfect clade if the pangolin was a part of it?
I recently promised Steve Bowden a sloth post, so I’m going to use this tweet as the basis.