. Bulletins of American paleontology. Diatoms and Environmental Change: Huvane and Cooper 149 £ o CL Q 100- 125- 150. \J - 25- IBr^ 50- pB^*——. 75- ? max. = 100- k 125- 150- Mastogloia crucicula r ~ I 1 1 0) CO Q Proportion Text-figure 3.—Relative abundances of select taxa from the Russell Bank core 19A. Relative abundances are standardized to the maximum abundance for each species. Values of 1 indicate a maximum abundance for that species. Samples are plotted by sample depth in centimeters. Dates (based on the averag
. Bulletins of American paleontology. Diatoms and Environmental Change: Huvane and Cooper 149 £ o CL Q 100- 125- 150. \J - 25- IBr^ 50- pB^*——. 75- ? max. = 100- k 125- 150- Mastogloia crucicula r ~ I 1 1 0) CO Q Proportion Text-figure 3.—Relative abundances of select taxa from the Russell Bank core 19A. Relative abundances are standardized to the maximum abundance for each species. Values of 1 indicate a maximum abundance for that species. Samples are plotted by sample depth in centimeters. Dates (based on the average sedimentation rate derived from Pb-210 analyses) are shown on the right. shown in Text-figure 2. The percent abundance of these species standardized to the maximum abundance of each species are shown in Text-figure 3. The two species of Cyclotella are grouped together in the Cv- clotella graph (Text-fig. 3) because these species were sometimes difficult to distinguish. The maximum abundance () of Cyclotella species occurs in the lower part of the core at the 88-90 cm sample interval. A second peak occurs at the top of the core, where the percent abundance reaches 60% of the total diatom count. Mastogloia species are most common in the bottom third of the core, comprising an average abun- Text-figure 2.—Light microscopic photographic images of representative diatoms from Russell Bank core 19A. a) Mastogloia corsicana b) Mastogloia crucicula c) Mastogloia sp. R d) Cocconeis phicentula var. euglypta e) Mastogloia avails f) Mastogloia sp. A g) Nitzschia granulata h) Cyclotella cf. striata i) Syneilra sp. A j) Gramiuatuphorci cf. oceunica var. macilenta k) Cyclotella cf. 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 Uni
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