lec_15_relative_time_scale

lec_15_relative_time_scale - Published first geologic map...

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Relative time scale
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Steno • Niels Stensen (1638-1686) Danish physician and anatomist – Research in Italy in 1660s, published geological conclusions in 1669 (Prodromus) • Superposition • Original lateral continuity • Original horizontality
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Strata Smith • William Smith (1769-1839) English surveyor – Made practical observation that each individual rock layer contained its own specific assemblage of fossils (Faunal Succession: first written down in 1796)
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Unformatted text preview: Published first geologic map of England (1815) Geologic systems Large thicknesses of sedimentary rocks that crop out over a region Descriptive names originally, based on rock type (Cb, K) Later named for geographic region where exposed Using faunal succession principle, systems based on fossil content rather than lithology By c. 1840 most of the systems recognized and named (Ordovician in 1879)...
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lec_15_relative_time_scale - Published first geologic map...

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