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Show 216 Lioplacodes sp. and Physa LaRocque, 1960). (Based sp. on (based three publlcaticns.) nyensis A similar and Pseudocypridina assemblage in the basal 50 eggshell types comparisons with descriptions recent communications with F. M. Swain the tentative identifications of B. in future on m occurs in the may be same in (2002), changed intervals the as of the North Horn Formation in Price River Canyon Dinosaurs that laid and swampy or marshy type 2 eggs This areas. probably inhabited shallow lake type eggshell has been found in rich limestones at North Horn Mountain and Price River (1987) indicated that the Price River The gastropod-eggshell similar setting. Physa sp. suggests breathing snail that The marginal, was a littoral or gastropod Fouch et al. the first 30 m shallow lacustrine of the setting. association at North Horn Mountain may indicate occurrence a Canyon. paleoenvironment represented by Canyon section margins of eggshells at the same stratigraphic very shallow lacustrine environment, since likely lived on plants that grew in shallow lake a levels Physa is an as air margins (LaRocque, 1960). The yellow highest bedded eggshells limestone that shows color This unit contains rounded and Features such evidence of a as these are at North Horn Mountain mottling and low-energy, palustrine as sediments subjected to a textures. and evidence of root traces. Alonso Zarza et al. (1992) as environment and subaerial exposure resulting from very shallow water depths. Similarly they (1989) found in pseudo-microkarstic angular intraclasts interpreted by were are interpreted by Platt repeated wetting and drying. We interpret the |
