. Bulletins of American paleontology. Diatoms and Environmental Change: Huvane and Cooper 151 0-1 1975- 25 50 1950- 1925- Depth (cm) 100- 1900- 125- 1875- 150-1 ^-] h Total sum of squares Text-figure 5.—A stratigraphically constrained cluster analysis of the Russell Bank core 19A diatom assemblages. The Y axis shows sediment depth with the top of the core at the top of the diagram. The second Y axis shows dates based on Pb-210 analyses. The samples counted along with the diatom zones are indicated on the left. Diatom Species Diversify' The Shannon-Weiner index of species diversity takes into a
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. Bulletins of American paleontology. Diatoms and Environmental Change: Huvane and Cooper 151 0-1 1975- 25 50 1950- 1925- Depth (cm) 100- 1900- 125- 1875- 150-1 ^-] h Total sum of squares Text-figure 5.—A stratigraphically constrained cluster analysis of the Russell Bank core 19A diatom assemblages. The Y axis shows sediment depth with the top of the core at the top of the diagram. The second Y axis shows dates based on Pb-210 analyses. The samples counted along with the diatom zones are indicated on the left. Diatom Species Diversify' The Shannon-Weiner index of species diversity takes into a