. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Bulletin Museum of Comparative Zoology, Vol. 152, No. 3 MONTANA LOGAN W BRIDGER RANGE Waulsortian bank WYOMING PLATFORM NW SE micrltlc llmaatona arglllacaoua iiiT!#»lont glauconltlc encrinlta! limestone BLASTOIDS crlnolda brachlopoda aolilary corals (â mall) bryozoana conodonta oatracoda agglutlnatad foramlnlfara holotrturlan aclarltaa aponga spicules Reuet be»»" black ahala and alltatona aandy dolontlta dolomlllc aandatona. MADISON GROUP Lodgepole Limestone Paine Member Madison Limestone Cottonwood Canyon Mam
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Bulletin Museum of Comparative Zoology, Vol. 152, No. 3 MONTANA LOGAN W BRIDGER RANGE Waulsortian bank WYOMING PLATFORM NW SE micrltlc llmaatona arglllacaoua iiiT!#»lont glauconltlc encrinlta! limestone BLASTOIDS crlnolda brachlopoda aolilary corals (â mall) bryozoana conodonta oatracoda agglutlnatad foramlnlfara holotrturlan aclarltaa aponga spicules Reuet be»»" black ahala and alltatona aandy dolontlta dolomlllc aandatona. MADISON GROUP Lodgepole Limestone Paine Member Madison Limestone Cottonwood Canyon Mambar I Cottonwood Canyon Mambar Little Bighorn Member Text-Figure 10. Transect across western Montana showing the paleoecologic setting for the lower Lodgepole blastoid fauna during the Siphonodella crenulata Zone. Although they were uncommon and widely spaced in the outer ramp, a Waulsortian bioherm is shown in this cross section growing upward toward the surface with blastoids living on its flanks (after Sandberg and Gutschick, 1983). In the eastern part of the area where blastoids are relatively abundant, the small globular genus Tanaoblastus is clearly dominant in the lower Lodgepole and Al- lan Mountain blastoid fauna. It is present at nearly every lower Lodgepole and Allan Mountain section where blastoids have been found. At most sections, Tanaoblas- tus is either the only form present or the dominant form, and is represented by a total of 1,109 specimens or about 88% of all the blastoids collected. Elongate ellip- soidal specimens of Strongyloblastus, conical and biconical specimens of the fis- siculate Orophocrinus, plus biconical specimens of Metablastus also occur in this lower zone fauna, but are much less common and more restricted in their dis- tribution. Specimens of these other genera are most common at a few sections in the central part of the study area in south- western Montana (see Text-Fig. 8), pri- marily Dry Hollow, Milligan Canyon, Mil- ligan Canyon
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
