ERSC 1F90 Lecture Notes - Lecture 1: Nicolas Steno, Programmable Thermostat, James Hutton
18 Feb 2016
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*per person per day we consume 300l of water. James hutton recognized the immensity of earth history in the late 1700"s. Interpreting earth history is a prime goal of geology. Rocks record geologic events and changing life forms of the past. The geologic time scale was developed and earths history was discovered to be exceedingly long. Placing rocks and events in their proper sequence of formation. Law of superposition (nicolaus steno in the 17th century) States that in an undeformed sequence of sedimentary rocks, each successive bed is younger. Principle of original horizontally layers of sediment are generally deposited in a horizontal position. Rock layers that are flat have not been disturbed. Principle of cross-cutting relations younger features (dykes, faults) cut across older features (pre-existing rocks) Unconformities an unconformity is a break in the rock record caused by erosion and or non deposition of rock units. When there is no break in the rock record, the rocks are considered conformable.
