Navigation Links
How to look at dinosaur tracks

A new study appearing in the May issue of The Journal of Geology provides fascinating insight into the factors geologists must account for when examining dinosaur tracks. The authors studied a range of larger tracks from the family of dinosaurs that includes the T. Rex and the tridactyl, and provide a guide for interpreting the effects of many different types of erosion on these invaluable impressions.

“Well-preserved vertebrate tracks in the rock record can be an invaluable source of information about foot morphology, soft tissue distribution, and skin texture,?write Jesper Milàn (Geological Institute, University of Copenhagen) and David B. Loope (Department of Geosciences, University of Nebraska, Lincoln). “However, in most instances, the tracks are less than perfectly preserved, and sometimes they can be barely recognizable as tracks at all.?

With this in mind, Milàn and Loope sought to describe and categorize different levels of preservation. For example, dinosaur tracks may still exist as true tracks, that is, the original prints left in the ground by the dinosaur. True tracks preserve many of the anatomical details of the foot, such as number of digits and impressions of claws.

However, the true tracks may be filled with sediment or the original tracked surface may have eroded away. In the latter case, erosion may expose prominent layers of concentric circles extending from the former location of the true track. These “undertracks?reveal the squishing and displacement of sand when the heavy dinosaur took a step.

“The tracks and undertracks of large theropods found in the [Middle Jurassic] Entrada Sandstone at the studied locality come in a wide range of morphologies, mainly as a result of present-day erosion that has exposed the track-bearing surfaces at different depths,?the researchers explain. “[They] demonstrate that great care should be taken when describing fossil footprints that have been exposed to subaerial erosion , because the shape, dimensions, and general appearance of the footprint become seriously altered by erosion.?

Geologists also must account for whether the step was taken on a sloped surface or on a horizontal surface, and whether it was taken during dry season or wet season.

For example, estimating foot length from tracks can be inaccurate without these considerations ?the more erosion that has occurred, the larger the apparent dimensions of the track. Applications of this apparently larger foot size derived from an undertrack may lead to calculations of higher estimated hip length, and, as the authors point out, may also lead to slower speed estimates.
'"/>

Source:University of Chicago Press Journals


Related biology news :

1. Revueltosaurus skeleton unearthed at Petrified Forest upsets dinosaur tale
2. Study: Predatory dinosaurs had bird-like pulmonary system
3. Skull study sheds light on dinosaur diversity
4. U. of Colorado researcher identifies tracks of swimming dinosaur in Wyoming
5. Newly discovered birdlike dinosaur is oldest raptor ever found in South America
6. Did feathered dinosaurs exist?
7. Fossil find: Godzilla crocodile had head of a dinosaur, fins like a fish
8. Next good dinosaur news likely to come from small packages
9. The worlds deepest dinosaur finding - 2256 metres below the seabed
10. FSU biologist says new dinosaur is oldest cousin of Tyrannosaurus rex
11. Insect predation sheds light on food web recovery after the dinosaur extinction

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/17/2017)... 2017 NXT-ID, Inc. (NASDAQ: NXTD ) ... of its 2016 Annual Report on Form 10-K on Thursday April ... ... in the Investor Relations section of the Company,s website at ... at http://www.sec.gov . 2016 Year Highlights: ...
(Date:4/11/2017)... DUBLIN , Apr. 11, 2017 Research ... Tracking Market 2017-2021" report to their offering. ... The global eye tracking market to grow at ... The report, Global Eye Tracking Market 2017-2021, has been prepared based ... report covers the market landscape and its growth prospects over the ...
(Date:4/5/2017)...  The Allen Institute for Cell Science today announces ... portal and dynamic digital window into the human cell. ... application of deep learning to create predictive models of ... a growing suite of powerful tools. The Allen Cell ... publicly available resources created and shared by the Allen ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... (PRWEB) , ... October 11, 2017 , ... ... pathology, announced today it will be hosting a Webinar titled, “Pathology is going ... Pathology Associates , on digital pathology adoption best practices and how Proscia improves ...
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions are ... 5.5 million people each year. Especially those living in larger cities are affected by ... in one of the most pollution-affected countries globally - decided to take action. , ...
(Date:10/10/2017)... CALIF. (PRWEB) , ... October 10, 2017 , ... San ... part of its corporate rebranding initiative announced today. The bold new look is ... reach, as the company moves into a significant growth period. , It will also ...
(Date:10/10/2017)... ... October 10, 2017 , ... Dr. Bob Harman, founder and CEO of ... Club. The event entitled “Stem Cells and Their Regenerative Powers,” was ... Dr. Harman, DVM, MPVM was joined by two human doctors: Peter B. Hanson, M.D., ...
Breaking Biology Technology: