Consequently the origin of precambrian stromatolites has been a subject of considerable controversy. The discovery of actual preserved remains of algae and bacteria in some Precambrian stromatolites has proven beyond question that most such rocks are the result of the activities of organisms
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Stromatolites are a type of fossil that is made from: the growth of cyanobacteria and other heterotrophic bacteria entrapped in calcium carbonate and other mineral sediments. There are structures in modern-day Western Australian near-shore habitats that are thought to be living modern equivalents of stromatolite fossils.
Stromatolites, sponges, stromatoporoids, and archaeocyathids study guide by dhsiung includes 12 questions covering vocabulary, terms and more. Quizlet flashcards, activities and games help you improve your grades.
Fossilized stromatolites A) all date from 2.7 billion years ago. B) formed around deep-sea vents. C) resemble structures formed by bacterial communities that are found today in some warm, shallow, salty bays. D) provide evidence that plants moved onto land in the company of fungi around 500 million years ago.
View Test Prep - Astro 3- Chapter 19 flashcards | Quizlet from ASTRO 1 at University of California, Los Angeles. Astro 3- Chapter 19 36 terms by amanile According to fossil evidence how far back in
What Are Stromatolites? Stromatolites are large formations of rocks that have been formed by the growth of multiple layers of bacteria over a very long period of time. These usually take the shape of mounds, columns and sheets.
Stromatolites are a major constituent of the fossil record of the first forms of life on earth. They peaked about 1.25 billion years ago and subsequently declined in abundance and diversity, so that by the start of the Cambrian they had fallen to 20% of their peak. The most widely supported explanation is that stromatolite builders fell victim to grazing creatures (the Cambrian substrate ...