Solve a Sedimentary Layers Puzzle

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SOLVE A SEDIMENTARY LAYERS PUZZLE Did you know that the 1. Photocopy and cut out the fi ve strips of paper history of life on Earth Each strip represents a sedimentary rock layer formed during a certain time period. is told through rocks? Dinosaur fossils Over millions of years, sediments 2. Put the layers in correct order have been such as sand and silt were laid FUN discovered on Begin by placing B, the “oldest layer,” FACT down and compressed to form on the bottom. Then decide which every continent, sedimentary rock layers. They layer comes next. It will have some even Antarctica. preserve a record of ancient land- of the same organisms as the older scapes, climates, and organisms. layer and some new ones. (Hint: Organisms do not disappear for a layer and then reappear.) Place it above. Continue until the layers are in order, Scientists often determine the with the youngest at the top. Check your answers and write the time correct sequence of sedimentary period on each layer. rock layers using the fossils found within them. They compare the Explore More! fossils to fi gure out if two layers Look at the fossils within each layer. What plants and animals lived are from the same geologic time during the same time period? Then compare the layers to explore the period, or if one layer is older changing plant and animal groups throughout Earth’s history. Which than the other. organisms survived from one time period to the next? Which ones went extinct? Could Tarbosaurus have hunted Seismosaurus? What organ- Try reconstructing the layers isms survived the mass extinction at the end of the Cretaceous Period? below using the same strategy! gingko sharks birds dyrosaurs horses dragonfl y fl owering A plants Coelophysis gingko pterosaur Effi gia dragonfl y sharks ammonites icthyosaurs B Postosuchus OLDEST LAYER gingko birds dragonfl y sharks ammonites fl owering Tarbosaurus dyrosaurs plants pterosaur C icthyosaurs bataar Homo sapiens gingko birds dragonfl y fl owering horses D sharks plants gingko ammonites birds pterosaur Seismosaurus Stegosaurus E dragonfl y sharks icthyosaurs C (Cretaceous Period, 145-65 mya), E (Jurassic Period, 200-145 mya), and B (Triassic Period, 250-200 mya) 250-200 Period, (Triassic B and mya), 200-145 Period, (Jurassic E mya), 145-65 Period, (Cretaceous C Order of layers from top to bottom: D (Quaternary Period, 2 million years ago to present), A (Tertiary Period, 65-2 mya), mya), 65-2 Period, (Tertiary A present), to ago years million 2 Period, (Quaternary D bottom: to top from layers of Order Answers: © 2007 American Museum of Natural History. All rights reserved..

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PALEONTOLOGY and BIOSTRATIGRAPHY of MONGOLIA the JOINT SOVIET-MONGOLIAN PALEONTOLOGICAL EXPEDITION (Transactions, Vol
PALEONTOLOGY AND BIOSTRATIGRAPHY OF MONGOLIA THE JOINT SOVIET-MONGOLIAN PALEONTOLOGICAL EXPEDITION (Transactions, vol. 3) EDITORIAL BOARD: N. N. Kramarenko (editor-in-chief) B. Luvsandansan, Yu. I. Voronin, R. Barsbold, A. K. Rozhdestvensky, B. A. Trofimov, V. Yu. Reshetov 1976 S. M. Kurzanov A NEW CARNOSAUR FROM THE LATE CRETACEOUS OF NOGON-TSAV, MONGOLIA* The Upper Cretaceous locality of Nogon-Tsav, located in the Zaltaika Gobi, 20 km NW of Mt. Ongon-Ulan-Ula, was discovered by geologists of the MNR. Then, in a series of years (1969–1971, 1973) the joint Soviet-Mongolian Geological Expedition investigated the site. According to the oral report of B. Yu. Reshetova, the deposits in this region are composed basically of sandstone and clay, clearly subdivided into two deposits. The lower great thickness contains many complete skulls, separate bones of tarbosaurs, ornithomimids, and claws of therizinosaurs. The upper red-colored beds are characterized only by scattered fragments of skulls. The fragments described below are of a new carnivorous dinosaur, Alioramus remotus (coll. South Goby region), from the family Tyrannosauridae, which occurs in the lower gray beds. Genus Alioramus Kurzanov, gen. nov. G e n u s n a m e from alius (Lat.) – other, ramus (Lat.) – branch; masc. G e n o t y p e — A. remotus Kurzanov, sp. nov., Upper Cretaceous, Nemegetinskaya suite, southern Mongolia. D i a g n o s i s . Tyrannosaurid of average size. Skull low, with highly elongated jaws. Nasals with well-developed separate crests of 1–l.5 cm height. Second antorbital fenestrae displaced forward, reaching the anterior end of the 5th tooth.
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A. K. Rozhdestvensky HISTORY of the DINOSAUR FAUNA of ASIA
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