Evolution of shallow-water level-bottom communities

Features of Cambrian level-bottom communities that inhabited carbonate and siliciclastic substrates are outlined. A high diversity of level-bottom communities with multiple trophic guilds was established in the Early Cambrian, replacing largely microbial-dominated Vendian ecosystems. Taxonomic richness of Early Cambrian communities contrasts with relative impoverishment of their Middle and Late Cambrian counterparts. Displacement of communities was common, and entire communities might migrate into areas with more favorable conditions if their original habitats suffered a crisis.

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