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Squatinactis caudispinatus (AKA Squatinactis montanus) Class Chondrichthyes, Order Squatinactida, Family Squatinactidae Geological Time: Mississippian (~320 m.y.a.) Size (25.4 mm = 1 inch): Fossil is 185 mm long (tip of nose to tip of tail along backbone) by 85 mm wide at pectoral fins on a 220 mm by 210 mm and 170 mm by 140 mm matrix pair Fossil Site: Heath Shale Formation, Bear Gulch Limestone, Fergus County, Montana

Squatinactis caudispinatus (AKA Squatinactis montanus) Class Chondrichthyes, Order Squatinactida, Family Squatinactidae Geological Time: Mississippian (~320 m.y.a.) Size (25.4 mm = 1 inch): Fossil is 185 mm long (tip of nose to tip of tail along backbone) by 85 mm wide at pectoral fins on a 220 mm by 210 mm and 170 mm by 140 mm matrix pair Fossil Site: Heath Shale Formation, Bear Gulch Limestone, Fergus County, Montana

Pseudoarctolepis Phyllocarid Fossil  From the Wheeler Formation Lagerstatte   Pseudoarctolepis sharpi  Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Subclass Phyllocarida  Geological Time: Early Middle Cambrian (~520 million years ago)  Size: Phyllocarid fossil is 49 mm long  Fossil Site: Wheeler Formation, House Range, Millard County, Utah

Pseudoarctolepis Phyllocarid Fossil From the Wheeler Formation Lagerstatte…

Lonchodomas sp.   Trilobites Order Asaphida, Family Tinucleidae  Geological Time: Ordovician  Size (25.4 mm = 1 inch): Trilobites: 39 and 23 mm long , 30 and 27 mm across. Matrix: 100 mm by 80 mm  Fossil Site: Tanssikhte, Zagora, Morocco

Trilobites Order Asaphida, Family Tinucleidae Geological Time: Ordovician Size mm = 1 inch): Trilobites: 39 and 23 mm long , 30 and 27 mm across. Matrix: 100 mm by 80 mm Fossil Site: Tanssikhte, Zagora, Morocco

Fossil specimen of Wiwaxia from the Burgess Shale on display at the Smithsonian in Washington, DC.

Wiwaxia Spiny Slug Fossil - This slugs main form of protection are the rows of armored plates covering itself and a couple rows of long spikes.

The Waco Mammoth Site showcases the remains of Columbian Mammoths that died in mudslides and flooding more than 60,000 years ago.  The Columbian Mammoth (Mammuthus columbi) is a species of prehistoric elephant closely related to their more famous cousins the Woolly Mammoth.  These animals thrived in the warmer temperate regions of the United States during the Pleistocene epoch.  Columbian Mammoths were slightly larger than most Woolly Mammoth types (M. primigenius) and they had slightly less…

The Waco Mammoth Site showcases the remains of Columbian Mammoths that died in…

Alalcomenaeus, Unusual Opabinid Arthropod Fossil Chengjiang   Alalcomenaeus sp  Geological Time: Early Cambrian (~525 million years ago)  Size: 10 mm  Fossil Site: Chengjiang Maotianshan Shales, Quiongzhusi Section, Yu’anshan Member, Heilinpu Formation, Maotianshan, Yuxi, Chengjiang County, Yunnan Province, China

Alalcomenaus, Unusual Opabinid Arthropod Fossil from Chengjiang Biota

Rare Hallucigenia Fossil from Utah; Hallucigenia sp.; Phylum Onychophora, Family Hallucigeniidae (Conway Morris, 1977)'; Geological Time: Upper Middle Cambrian; Size: 15 mm by 25 mm Fossil Site: Spence Shale, Box Elder County, Utah

Rare Hallucigenia Fossil from Utah; Size: 15 mm by 25 mm Fossil Site: Spence Shale, Box Elder County, Utah

Name: Family Antedontidae; Antedon pinnulata Geological Time: Cretaceous Lower Cenomanian Stage (95 million years ago) Size: 115 mm by 90 mm (maximum) on a 140 by 100 mm matrix Fossil Site: Haqel, Lebanon

Antedon pinnulata Geological Time: Cretaceous Lower Cenomanian Stage million years ago) Size: 115 mm by 90 mm (maximum) on a 140 by 100 mm matrix Fossil Site: Haqel, Lebanon

Juvenile Iniopterygian “Flying Shark” Fossil from Bear Gulch Part and Counterpart    Inioppterygii indet.  Geological Time: Mississippian (~320 m.y.a.)  Size (25.4 mm = 1 inch): Fish fossil: 22 mm long; Matrix: 250 mm by 175 mm and 185 mm by 145 mm pair  Fossil Site: Heath Shale Formation, Bear Gulch Limestone, Fergus County, Montana

Juvenile Iniopterygian “Flying Shark” Fossil from Bear Gulch Part and…

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