100th Featured Species: Whorl-Tooth Shark (Helicoprion spp.)
100th Featured Species: Whorl-Tooth Shark (Helicoprion spp.)
intro
 fossilization process
 distribution
FIGURE 1. Early Permian paleogeography of Helicoprion specimens. 1 Phosphoria Sea: Idaho, Utah, Wyoming, U.S.A.; 2 Eastern Panthalassia: AlbertaâBritish Columbia, Canada; 3 NevadaâCalifornia, U.S.A; 4 Texas, USA; 5 Mexico; 6 Laurussian epeiric sea: Melville Island, Canada; 7 Ellesmere Island, Canada; 8 Spitsbergen, Norway; 9middle Urals, Russia;âŚ
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