| Literature DB >> 17759393 |
Abstract
Columnar stromatolites (organosedimentary structures built by bluegreen algae) show a marked decrease in diversity in the Late Precambrian; this decrease in diversity occurs at approximately the same time as the appearance of metazoans, 600 to 700 million years ago.Entities:
Year: 1971 PMID: 17759393 DOI: 10.1126/science.174.4011.825
Source DB: PubMed Journal: Science ISSN: 0036-8075 Impact factor: 47.728