Oysters are an invertebrate the lives today in brackish waters along coastal zones. when a geologist working in stratified rocks observes a limestone bed with oyster fossils overlain by beds with clam and echinoderm fossils indicative of marine conditions, the fossils probably indicate

When a geologist working in stratified rocks observes a limestone bed with oyster fossils overlain by beds with clam and echinoderm fossils indicative of marine conditions, the fossils probably indicate that the environment had changed as the sea level rose and it displaced the oysters environment with marine conditions represented by the clams and echinoderms.

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