BUS 312 Lecture 3: unit 11
13 Mar 2018
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Document Summary
Some form of h. erectus arrived by 1. 4 mya. Cranial fragments that date to 1. 6 mya. Layer 6 had 100 pieces of hominin bones/tools. Radiometry (absolute dating technique by measuring volcanic ash) and paleomagnetism suggest these remains are 800-875 kya. In matuyama reverse chron, right between the boundary and jaramillo chron. Sima del elefante (pit of the elephant) Species of rodent from level 9 date from 1. 5 to. Bruhnes/matsuyama boundary is b/w layer 16 and 17 (at the top) Jaramillo subchron at layer 12 therefore , layer 9 has to be atleast older than 1. 1 mya. Earth has a positive end (positive and a negative end when the last time the sedimentary particles were exposed to light (south) Magnetic fields flows south to north (- to +) We used this to date sites by finding the chrons: magnetic reversals. Sediments contain iron particles and will orient themselves according to whatever is positive at the time.
