Types of dating fossils

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Early history[ edit ] In Ancient Greece , Aristotle BCE observed that fossils of seashells in rocks resembled those found on beaches — he inferred that the fossils in rocks were formed by organisms, and he reasoned that the positions of land and sea had changed over long periods of time. Leonardo da Vinci — concurred with Aristotle's interpretation that fossils represented the remains of ancient life. Steno argued that rock layers or strata were laid down in succession, and that each represents a "slice" of time. He also formulated the law of superposition, which states that any given stratum is probably older than those above it and younger than those below it. While Steno's principles were simple, applying them proved challenging.
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Fossils and Geologic Time

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Carbon, Radiometric Dating - CSI

The oldest rocks in the world occur in the Canadian Shield. Their ages have been calculated from precisely measured ratios of the radioactive decay of trace amounts of certain isotopes in the rock sample. The ratio of… The Precambrian environment Several rock types yield information on the range of environments that may have existed during Precambrian time. Evolution of the atmosphere is recorded by banded-iron formations BIFs , paleosols buried soil horizons , and red beds, whereas tillites sedimentary rocks formed by the lithification of glacial till provide clues to the climatic patterns that occurred during Precambrian glaciations. Paleogeography One of the most important factors controlling the nature of sediments deposited today is continental drift. The continents are distributed at different latitudes , and latitudinal position affects the temperature of oceanic waters along continental margins the combined area of the continental shelf and continental slope ; in short, sedimentary deposition is climatically sensitive.
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Classroom Resources

What about the fact that the "simple" organisms are buried in the lower levels and the more "complicated" ones are buried in the higher levels? Doesn't this fact support the notion that simple organisms evolved into more and more complex organisms over time, with the more complex organisms buried and fossilized above the earlier and simpler life forms? Certainly this seems like a very logical assumption. But, things just aren't that easy. There are a number of potential problems with this interpretation of the fossil record.
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These formations may have resulted from carcass burial in an anoxic environment with minimal bacteria, thus slowing decomposition. Stromatolites Lower Proterozoic stromatolites from Bolivia , South America Stromatolites are layered accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms of microorganisms , especially cyanobacteria. While older, Archean fossil remains are presumed to be colonies of cyanobacteria , younger that is, Proterozoic fossils may be primordial forms of the eukaryote chlorophytes that is, green algae. One genus of stromatolite very common in the geologic record is Collenia.
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