BE 4323 Chapter : Tissue Dynamics
Document Summary
False (meteorite-> mass extinction: geological changes are always gradual. False (earthquakes, meteorites: rocks and living things have never basically changed. Processes that shape earth have operated at the same rate throughout geologic time. Cutting rock is younger: principle of inclusions- rock within another rock. Inside rock is older: principle of cross-cutting relationships, steno"s principles (nicholas steno 1638-1686) on. Older on the bottom, younger on the top: original horizontality. All layers are horizontal when they form, all the deformation must happen after: lateral continuity. If the rocks on the opposite sides of a valley are similar, the sedimentary rock formed first, then the river cut through. Principle of fossil succession: fossils succeed one another in a definite, irreversible, and determinable order. (william smith 1767-1839) Geologic time unit: eon, era, period, epoch, today; phanerozoic eon, cenozoic era, quarternary period, International units: ga=giga-annum (billions, ma=mega-annum (millions, ka=kilo-annum (thousands) Rock cycles: endless pathway of rocks of varying kinds transformed into rocks of other kinds.
