ECON 2010 Chapter : Econ 2010 Chapter 14 Powerpoint
Document Summary
Pliocene (5-1. 8 mya: hominids and hominins. The big 3 : culture, brain size, obligate bipedality- means it"s the primary way we get around. Bipedal locomotion is extraordinary in that, with each step, the body teeters on the brink of catastrophe. *skull: foramen magnum- this whole in the bottom of the hole, and this is the whole that the spinal cord goes through. Skeletal adaptions for bipedality: spinal curvature- shock observer, holds are body stabled why we are moving, pelvis shape (ilium/ilia) - they have a more anterior, postier, postation, front to back of the ilia. Laterally oriented ilia- side to side not front to back. Limb ratios- in humans, our legs are longer than our arms. Hypothesis for bipedality: freeing the hands: African rift valley: where tectonic plates rub against each. A lot of volcanic activity in the past (affects stratigraphy) Many of the fossil sights have been found through erosion.
