. Bulletins of American paleontology. Dominican Columbellid Gastropods: Jltng Ili'l17 1 7r90 -".LP *>) W.'HH ' I /l.'-I .<â¢,«. CO c (0 N 0) Q. O S e CO Q- CO (0 Q. UJ Text-figure 4âColumnar section of cliff exposures on Rio Yaque del Norte near Lopez, north of Baitoa. showing "ranges" of species discussed herein and stratigraphic positions of NMB localities (after Saunders el al., 1986, text-fig. 25). U31b 1 7J'J1 I I â I f:-^=ei7 .âI : .^ â Silii . Hjv* E 1 / JtiH ⢠- ^1 1 tot. I / JUb \7J0} 1 /."Jb ! ? J'Jb 1 /J^I4 o :ijV wiih |)liiii) c £â
. Bulletins of American paleontology. Dominican Columbellid Gastropods: Jltng Ili'l17 1 7r90 -".LP *>) W.'HH ' I /l.'-I .<â¢,«. CO c (0 N 0) Q. O S e CO Q- CO (0 Q. UJ Text-figure 4âColumnar section of cliff exposures on Rio Yaque del Norte near Lopez, north of Baitoa. showing "ranges" of species discussed herein and stratigraphic positions of NMB localities (after Saunders el al., 1986, text-fig. 25). U31b 1 7J'J1 I I â I f:-^=ei7 .âI : .^ â Silii . Hjv* E 1 / JtiH ⢠- ^1 1 tot. I / JUb \7J0} 1 /."Jb ! ? J'Jb 1 /J^I4 o :ijV wiih |)liiii) c £â 3 (D Q) C AHHOYO HONOd (D Silr Willi LOijI ilulrns g: £- 3 LU LA HAHHANi:A 1 StiBliv ii'ti 1 I A not A tj iMiu ' L MjHily hriieiiDne ARHOYO I 0HE2 SliellV I 6kez ;.Li noN. (/) E o Sj 3 TO 3 0) c Q) > 3 0 I I I Text-figure 5. âSchematic column for Rio Yaque del Norte show- ing "ranges" of species discussed herein and relative stratigraphic positions of NMB localities: black squares represent localities col- lected for microfossils and lithologic analyses: black circles represent localities collected for macrofossils (after Saunders el 1986, text- fig. 24). made to refigure old type specimens of the species discussed herein and specimens which are important for comparative purposes. A short discussion of species concepts has been given by Jung (1986, p. 9; 1989, p. 37). Definitions of the headings used in the following systematic part may be found in Jung (1989, p. 3 5) and in Jung and Petit (1990, p. 93). They are not repeated here. The 13 species of columbellid gastropods described. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [
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