What geological feature suggested a quiet, low-energy water environment like a long-lived lake?
Answer
Layered rocks exhibiting sedimentary structures.
The detailed analysis of sedimentary rocks encountered during Opportunity's traverse yielded critical insights into the nature of ancient Martian water. Specifically, the discovery of fine-grained, layered rock structures demonstrated characteristics typical of materials deposited by moving water. The texture and specific layering suggested formation in a quiet, low-energy setting, such as the bottom of a long-lasting lake or sea, rather than the result of a sudden or brief influx of water, contrasting with evidence found in terrestrial riverbeds.
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