. Bulletins of American paleontology. Late Cambrian Trilobites of Nevada: Adrain and Westrop Base of Notch Peak Fm. ^ 405 to s â 53 E ^ 400- - 395- /^~-x j^ ^ wd^\\\\\) ^ 390 380- Poorly exposed. probably th rem bo I i tic = ] Sample interval 1 ® 2 ^ Text-figure 3.âStratigraphic column through the upper Bull- whacker Member, Barton Canyon. Cherry Creek Range, showing the interval that yielded the trilobite faunas described herein. Scale in meters above the base of the Catlin Member The entire Bull- whacker is about 270 m in thickness at this locality. 1. sandy bio- clastic limeston
. Bulletins of American paleontology. Late Cambrian Trilobites of Nevada: Adrain and Westrop Base of Notch Peak Fm. ^ 405 to s â 53 E ^ 400- - 395- /^~-x j^ ^ wd^\\\\\) ^ 390 380- Poorly exposed. probably th rem bo I i tic = ] Sample interval 1 ® 2 ^ Text-figure 3.âStratigraphic column through the upper Bull- whacker Member, Barton Canyon. Cherry Creek Range, showing the interval that yielded the trilobite faunas described herein. Scale in meters above the base of the Catlin Member The entire Bull- whacker is about 270 m in thickness at this locality. 1. sandy bio- clastic limestone and calcareous sandstone; 2. wave-rippled oolitic grainstone; 3. bioclastic rudstone; 4. intraclastic rudstone; 5. throm- bolitic microbial buildups. unpublished data). The basal few centimeters of the Catlin Member contains a fauna that includes Elvinia roeineri (Shumard, 1861), and this is followed by a 15-m interval with undescribed species of LoganelIns Devine, 1863. Wiijiajianial Lu and Lin, 1980, and Dntmaspis Resser, 1942 (Adrain and Westrop, unpub- lished data). The remainder of the Catlin is unfossil- iferous, but the faunas of the lower 100 m of the Bull- whacker resemble the deep subtidal assemblages of the Rabbitkettle Formation of northwestern Canada (Lud- vigsen, 1982; Westrop, 1995), and include Idiomesiis Raymond, 1924, Yukonaspis Kobayashi, 1936a. Ta- tonaspis Kobayashi, 1935, Parabriscoia Kobayashi, 1935, Hungaia Walcott, 1914, Elkonaspis Ludvigsen, 1982, Naitstia Ludvigsen, 1982 and Eurekia Walcott, 1916. The upper Bullwhacker includes the fauna de- scribed herein, and its age and correlation are dis- cussed below. The base of the Notch Peak Formation is a 50-cm- thick bed of sandy, cross-bedded bioclastic rudstone that provides the foundation for the overlying micro- bial buildups. The trilobite fauna of this rudstone in- cludes Eurekia longifrons Westrop, 1986b and Men- iscocoryphe platycephala (Kobayashi, 1935), and demonstrates that the Windfall-Not
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