File:Dinosaur eggshell fragment (Upper Cretaceous; Patagonia, Argentina) (15545872935).jpg
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Dinosaur eggshell fragment from the Upper Cretaceous of Patagonia, Argentina (5.2 cm across; eggshell thickness is 4 to 5 mm). Eggshells are good examples of biogenic products. Eggs were originally small, living cells. But hard eggshells are mineralized - the material was never alive, and thus are biogenic products. The most impressive fossil eggs are those of dinosaurs. Dinosaur nests having eggs in their original laying position are known from several localities around the world. Sometimes, x-ray analysis or cat-scan analysis shows the presence of dinosaur embryos inside intact eggs. The embryos would be body fossils, but the surrounding eggshell material is a biogenic product. This dinosaur eggshell fragment has been attributed to a sauropod dinosaur. Note that the eggshell has surface ornament - it is covered with relatively large pustules/tubercles. Biogenic products are objects produced by ancient organisms. Many paleontologists refer to these as trace fossils, but they really aren't. Examples of fossil biogenic products include eggs, amber (fossilized tree sap), coprolites (fossilized feces), and spider silk. Some references on amber & fossils in amber: Poinar, G. & R. Poinar. 1994. The Quest for Life in Amber. Reading, Massachusetts. Addison-Wesley Publishing Company. 219 pp. Dahlström, A., L. Brost & J. Leijonhufvud. 1996. The Amber Book. Tuscon, Arizona. Geoscience Press, Inc. 134 pp. Grimaldi, D.A. 1996. Amber, Window to the Past. New York. American Museum of Natural History. 215 pp. Ross, A. 1998. Amber. London. The Natural History Museum. 73 pp. Poinar, G.O. & R. Milki. 2001. Lebanese Amber, the Oldest Insect Ecosystem in Fossilized Resin. Corvallis, Oregon. Oregon State University Press. 96 pp. Geirnaert, E. 2002. L'Ambre, Miel de Fortune et Mémoire de Vie. Monistrol-sur-Loire, France. 176 pp. [in French] Hong Youchong. 2002. Amber Insects of China. Beijing. Beijing Scientific Publishing House. 653 pp. 48 pls. [in Chinese] Weitschat, W. & W. Wichard. 2002. Atlas of Plants and Animals in Baltic Amber. Munich. Dr. Friedrich Pfeil. 256 pp. [excellent resource! highly recommended!] Selden, P. & J. Nudds. 2004. Baltic amber. pp. 131-141 in Evolution of Fossil Ecosystems. Chicago. University of Chicago Press. |
| Date | |
| Source | Dinosaur eggshell fragment (Upper Cretaceous; Patagonia, Argentina) |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15545872935 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 09:07, 1 December 2019 | | 711 × 706 (476 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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