21 November 2009

Fossil Vertebrate of the Month: Tiktaalik

I used to have a feature on my academic site where I would pick a Fossil Vertebrate of the Month, about which I would write a little blurb and provide relevant links. I had let FVOTM lapse, but was recently encouraged to restart it, and I thought I would share it on this blog as well. Enjoy!

This November 24th marks the 150th anniversary of the publication of Charles Darwin's On the Origin of Species, one of the most important books in history. Darwin famously devoted a chapter of his magnum opus to the imperfection of the fossil record and why transitional fossils supporting his theory might prove to be difficult to find. "Missing links" do remain rare, but they are uncovered from time to time, and the most spectacular example from recent history is this month's featured animal. Famously touted for its combination of fish and tetrapod features, Tiktaalik is actually a link in a well-documented transition between lobe-finned fish such as Eusthenopteron through "fishapods" such as Panderichthys and Acanthostega to true tetrapods such as Ichthyostega. Not only is Tiktaalik an impressive fossil (or, more accurately, group of fossils, as severals pecimens have been uncovered), but it provides an excellent example of the predictive power of evolutionary theory. Chicago paleontologist Neil Shubin actually went out looking for something very like Tiktaalik; he knew the approximate age of a gap in the tetrapod fossil record, he knew that most early tetrapod fossils had been found in rocks from around the edges of the North Atlantic, and that rocks of the appropriate age (Late Devonian) outcropped on Ellesmere Island in the Candian Arctic (one of the closest major land masses to the North Pole, appropriately enough for this time of year). Shubin's hypothesis proved to be correct, and a 2004 expedition uncovered the first remains of Tiktaalik, which has since taken its place alongside Archaeopteryx and Australopithecus as one of the most impressive transitional fossils ever discovered.

14 November 2009

Burian & Knight Videos

Back when I first got my new computer, I thought it would be fun to test out the capabilities of Apple's movie program, so just for kicks I put together a couple of video tributes to my two favorite paleoartists, Zdenek Burian and Charles. R. Knight. I stumbled across them today while looking through some of my older files and figured it was time they saw the light of day, as it were.

10 November 2009

New Look

Given the neglect this blog has experienced lately, I thought it was high time for some changes to be made. Any of my handful of long-time readers will notice that there's a new look, but I'm also going to make a concerted effort to change the content slightly. Looking back over my last several entries, I notice that a great man of them are somewhat long-winded descriptions of trips I've been on or things I've done. Way back when I started blogging, sharing my experiences was the whole point, given that I was a few thousand miles from all my friends and family. Now that I'm firmly ensconced back in the States, though, I imagine rambling travelogues and the like are getting a little boring. From now on, I'm going to try and focus more on what I think are the strengths of this blog: "insider" thoughts on paleontology and the Pacific Northwest, probably the only two areas to which I can realistically cast myself as an "insider" (whatever that means). There will, as always, be digressions - probably lots of them - but I will do my best to keep things at least relatively interesting to a larger audience. Stay tuned!