Abstract
Radiolarians show potential value as indicators of neritic versus oceanic conditions in Cenozoic continental-margin deposits. Analyses of radiolarian assemblages from the lower to middle Miocene Calvert Formation (mid-Atlantic Coastal Plain) produce convincing evidence that indicates increasingly neritic environments upward through the section. The Calvert assemblage consists of44 taxa, dominated by spongy spumellarians (typical of modern shelf waters). Radiolarian diversity and the ratio of nassellarians to spumellarians decrease upward through the section. Family group distribution in the Calvert assemblage appears to differ from normal pelagic radiolarian distribution. Also, certain subsurface-dwelling radiolarian taxa found in the lower, phosphatic portion of the section may indicate upwelling during deposition of that interval.
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