Monday, March 7, 2011

Burgess Shale creatures live on!

I apologize for my recent absence - I am now a mom!

Back to Spineless things... I am currently working on unwrapping a series of fossils collected in Morocco. You may have seen some of these featured on the cover of Nature or in the New York Times. Ever specimen I unwrap is somehow new and exciting; it's like Christmas in March! All kinds of new research is being done with these specimens, but one aspect that I find especially important is the value of these lagerstätte. Now you may be asking yourself, lager-what? A lagerstätten is (as used by us paleontologists) a deposit of extraordinary preservation. Think of the Solnhofen Limestone in Germany where Archaeopteryx is preserved or the insects of Florissant National Monument. These types of deposits preserve fine details that are ordinarily lost in the fossil record. Whether they are impressions of feathers or cell outlines in a dragonfly's wing, these deposits are invaluable to paleontologists.

A fly from the Florissant beds. See more insects here.
Check back later in the week for more about lagerstätte, Morocco and the Burgess Shale!

Friday, October 22, 2010

Paleo-Knowledge Bowl

How do you get kids excited about science and involve them even more in current research and museum activities? A Paleo-Knowledge Bowl! Here at the Peabody, our fabulous public education and outreach program has held such an event for the last thirteen years. Kids from 4th-6th grades form teams of three. After brushing up on general paleontology trivia (always a valuable skill) and learning the year's latest paleo-news, these teams descend on the Peabody Museum for an all-day event which culminates in a final round held underneath our dinosaurs in the Great Hall. You can learn more about our event (or register a team) here.
Even smaller-scale versions of an event like this can be a great learning experience for students of any age. This is the time to let your paleo-geekiness shine through!

Wednesday, October 13, 2010

Happy National Fossil Day!

I love holidays in general, but this one has to hold a special place. It's National Fossil Day! The National Park Service has decided that today, October 13, 2010, will be our country's first annual holiday to celebrate our prehistoric past. They even made a song and a video. They held an art contest (you can see the winners here). The drawing here is my favorite of the batch - drawn by an 8 year old named Lily from Gettysburg, PA.
I am one of those scientists who studies animals that are dead (although mine are all invertebrates). 
This day really helps to highlight the importance of preserving our planet's past. Museums around the country are hosting special activities today. If you're in the New Haven area, check out the Yale Peabody Museum. We've got all kinds of special activities planned that you can find out about here. If you live somewhere else, check out your local museum to see if they've got any special plans to celebrate today!

And just so you know, my love of paleontology began with rugose corals. How about you? What's your favorite fossil?


Thursday, October 7, 2010

Fossil Cycad National Monument

I consider myself fairly well-versed in the National Parks and Monuments of this country, but I'll admit this was one I'd never heard of before. A bit of research led me to write this post both about the history of this forgotten Monument. This commemorative image for the Fossil Cycad National Monument comes from the NPS website.

The story of this monument begins with the discovery of fossilized cycadeoids in 1892 by F. H. Cole. He sent photographs to Henry Newton, a geologist at the Smithsonian. Interest in the site began to pick up among paleobotanists. Ultimately, George Wieland (a paleobotanist from Yale University) secured the land under the Homestead Act "in order that the cycads might not fall into unworthy hands" (Hot Springs Weekly Star, 1938). I'll return to this particular statement later in the post.

Two years later, Wieland turned the land over to the government so that the land could become a National Monument. President Harding signed the Fossil Cycad National Monument into being on October 21, 1922. Not much was done to develop the site for the next decade. In 1935 Wieland supervised a group of CCC workers who excavated a number of test pits. Over a ton of uneroded cycadeoid specimens were removed during these excavations. Wieland was keen on developing this site as an in situ site for the public to see fossils. In a 1937 Science discussion Wieland writes, "Fossil Cycad Monument more than all others of its series is as we now see dependent on an absolutely in situ development and display. Without this it can mean but little, as a mere blurred shadow, all but lost again in the shuffle of time." However, accusations were made against Wieland that he removed all surficial cycadeoid specimens prior to turning the land over to the federal government. Also, that all cycadeoid specimens that had been unearthed ended up in museum collections including the Smithsonian and the Peabody. By 1956 no cycadeoids could be found at the surface anywhere in the 320 acre Monument. The Monument was abolished on September 1, 1957, and on December 6, 1957 the land was turned over to the BLM.

The story of this National Monument has a couple of important lessons for us. First, many areas of our country hold specimens from the planet's history, and without our stewardship they will never be protected. Second, if a particular parcel of land does not have some kind of impressive scenery or value to wildlife, then its desirability is limited. A visitor center describing a fossil forest buried under the ground is not nearly as impressive as a visitor center located near an exposed fossil forest. As Harry Slattery, personal assistant to Secretary of the Interior Ickes wrote in 1937, "It is realized that the area is of outstanding paleobotanical interest . But it is also realized that the subject of fossil cycads does not have a broad appeal and, therefore, extensive development of the monument would benefit only a limited group of people. This is particularly true since the area does not possess other outstanding attractions. The scenery is neither impressive nor is it unusual; the geological interest, other than its paleobotanic relations, is not phenomenal; the area is too small for wildlife preservation; the terrain does not lend itself well to recreational development, and there is little historic interest."

A more in depth history can be found here.

Thursday, September 30, 2010

A heads up for National Fossil Day!

As I'm sure you are all aware, October 13, 2010 marks America's first National Fossil Day! You can learn all about it at the National Parks website. This is a day to celebrate our prehistoric heritage. I'll have a more complete post about this closer to the big day.

In honor of this upcoming holiday, I will write today about one of my favorite fossils. Yes folks, it is the Ohio state fossil Isotelus. First, what isn't there to love about a large trilobite? Second, the history of Isotelus in Ohio goes back a long way.

Isotelus specimens from Ohio were first described by John Locke in the late 1830s under the guise of the first Geological Survey of Ohio. Much of southwestern Ohio is underlain by Late Ordovician rocks. These rocks were deposited as part of a shallow epicontinental sea. They are full of fossils of brachiopods, bryozoans, bivalves, gastropods, trilobites, and many other critters. These rocks are now exposed in streambeds and roadcuts around Cincinnati and the surrounding area.

Huffman Dam Isotelus
Two elementary school groups had been to the Dayton Museum of Natural History (now the Boonschoft Museum of Discovery) and seen a cast of one of the largest whole trilobites found in Ohio - the Huffman Dam specimen. The children wrote letters to their representatives and the issue received widespread publicity. On June 20, 1985, Isotelus became the state fossil of Ohio.

*Much of this information comes from the Ohio DNR's  GeoFacts #6, available here.

Thursday, September 9, 2010

The problem with caves

Caves pose specific problems to many forms of life. Caves are dark, and animals must develop their non-optic senses to survive. Many cave organisms have no pigment - what's the point of a pretty color pattern if no one can see it? On the right is a photo of a blind cave fish from the National Park Service's Ozark Riverways page. As you can see, it has no pigment and no eyes. Over time this group of fish has evolved inside caves and lost many of the features that would be beneficial in a normal stream habitat.

Now, you may be wondering why I'm talking about living things. I just felt it was a nice lead-in to my cave discussion. Here's my cave discussion: Caves are really hard to georeference. The Best Practices for Georeferencing tell us to georeference the mouth of a cave for a specimen that was collected within the cave system. But what do you do when a cave system has multiple entrances? Take Mammoth Cave in Kentucky for instance. There are presently over 30 entrances (not all natural) known for this cave system. If we had a fossil collected from within Mammoth Cave, we may be able to pick an appropriate entrance based on locality data.
Historical entrance to Mammoth Cave (photo)
If the specimen was collected prior to 1921, then the most logical choice would be the "Historical Entrance." This was the only entrance known until 1921.

The cave was initially one among many caves in the area. If locality data named one of the other caves which has since been connected to the Mammoth Cave system, it would be logical to georeference an entrance to that portion of the cave system.
As for determining the extent of error on that point, the Best Practices suggest using the surface extent of the cave. For Mammoth Cave, there are over 365 miles of the system that have been explored. Could historical data be helpful here as well? If the specimen was collected early in the cave's explored history, could a map of the cave system at that time be used to determine a lesser extent of error?
Mammoth Cave provides an extreme example of potential problems one encounters when trying to georeference cave specimens. And, until GPS units can get signals underground, these problems will continue to pester us. The Best Practices guide provides a method to consistently georeference caves even when they are very extensive.

Thursday, September 2, 2010

Paleoentomology

Paleoentomology is a subject about which I know very little. That disclaimer aside, I am now going to talk about it, but not in any in depth manner. This subject comes up because yesterday I was pulling some type specimens. During this process I probably looked through a few hundred Permian fossil insects. Today I share with you one of these specimens: Dunbaria fasciipennis. This specimen is especially relevant to me and the Peabody collection for two reasons. First, it is from the Early Permian Elmo Limestone of Kansas (this is the formation I was looking through yesterday to find the type specimens). Second, it is named for one of our famous curators here in IP, Carl Dunbar.

For those of you who are curious, Dunbaria is a genus belonging to the Permian Palaeodictyoptera. This particular species has a wingspan of 3-4 cm. The pictured specimen above is the part of YPM 1002. Here is the counterpart of the same individual: