GEL 12 Lecture Notes - Lecture 2: Conodont, Foraminifera, Radiogenic Nuclide
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This collects and compresses into sedimentary rocks: sandstone. Layered rocks: altered rocks (metamorphic rocks, caused by heat and pressure, marble, what is the relative age, ca. =circa: ma = million years ago, rarely date the fossils themselves date the rocks they are found in, exception: young fossils can be dated using carbon 14, index fossils, fossils biostratigraphy. Isotope ration: geomagnetic polarity chron, principle of superposition, younger beds of rock, older rock on the bottom, relative ages are the age based on what layer of rock the fossil was found in. The (cid:862)deeper(cid:863) the rock, the older it is. 2: use a mass spectrometer to detect subtly differences in the mass of elements. Can use once the half life time period has been ided: 2 layers of volcanic rocks between the sedimentary. Jurassic (first bird: triassic (first dinosaur, eras are divided into periods (cretaceous, jurassic, triassic) divided into epochs, divided into ages, divided into sub ages.
