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from article Acanthodii

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Jaws of an Early Devonian ischnacanthid from northern Canada. The upper palatoquadrate and lower meckelian cartilages have tooth-bearing jawbones along their facing edges. (From University of Alberta, Laboratory for Vertebrate Paleontology…

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from article Acanthodii

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Examples of acanthodians from the Early Devonian of northern Canada. (a) Primitive climatiiform Lupopsyrus. (b) Diplacanthid Tetanopsyrus. (c) Ischnacanthiform Ischnacanthus. (d) Unnamed mesacanthid acanthodiform. (From the University of Alberta,…

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from article Lichens

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The ascolichen Teloschistes chrysophthalmus. (Credit: Jason Hollinger)

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from article Lichens

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Cuplike lichens of the genus Cladonia. (Credit: Jacinta Lluch Valero)

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from article Dune vegetation

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American beachgrass (Ammophila breviligulata), which dominates coastal dunes along much of the Eastern seaboard of the United States and the Great Lakes. (Photo by Rob Routledge, Sault College, Sault Ste. Marie, Ontario, Canada)

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from article Dune vegetation

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Sea oats (Uniola paniculata) are abundant on the foredunes of the Atlantic coast of the southeastern United States. (Photo by Robert L. Anderson, USDA Forest Sevice)

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from article Dune vegetation

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Bitter panicum (bitter panicgrass; Panicum amarum), which is often found on Gulf of Mexico coastal dunes. (Photo by Forest and Kim Starr)

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from article Index fossil

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Three cephalopod genera forming an evolutional sequence. Their short ranges (indicated by bars) and distinctive suture lines (the area between two sutures is shown in black) make them ideal index fossils for the early Pennsylvanian Period. (After A.…

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from article Index fossil

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Different concepts of range zones based on various combinations of overlap of two or more index species. (From D. R. Prothero and F. Schwab, Sedimentary Geology: An introduction to Sedimentary Rocks, Freeman, 1996)

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