Sample I is a wonderful shell hash or coquina from the Supai Rocks well up the

Sample i is a wonderful shell hash or coquina from

This preview shows page 13 - 15 out of 15 pages.

Sample I is a wonderful shell hash, or coquina, from the Supai Rockswell up the side of the Canyon, and contains shells from a greatdiversity of different creatures. Sample II includes algal­mat deposits(stromatolites) from the Precambrian Chuar Group of the GrandCanyon Supergroup, deep in the Canyon near the river, from a timewhen biology was not a whole lot more diverse than algal mats. LakeWinna­Bango featured in the gripping Dr. Suess tale of Thidwick, theBig­Hearted Moose, but is not pictured here. 1 / 1 ptsQuestion 14Geological evidence based on several radiometric techniques has provided ascientifically well­accepted age for the Earth. Represent that age of the Earthas the 100­yard length of a football field, and any time interval can berepresented as some distance on the field. (So something that lasted one­
Image of page 13
3/31/2019 RockOn #10: GEOSC 10 Spring 2019, Merged 14/15 tenth of the age of the Earth would be ten yards, and something that lastedone­half of the age of the Earth would be fifty yards.) On this scale, how longhave you personally been alive? 10 yards. 50 yards. 1 yard. Much less than the thickness of a sheet of paper. Correct! Correct! 1 inch. If the 4.6 billion years of Earth history are 100 yards, then the few thousand years of written history are just one­millionth of that history, just over the thickness of a sheet of paper. And your small piece of written history must be only a small fraction of a sheet of paper, roughly 1/200th or so. 1 / 1 pts Question 15What is accurate about the scientific results learned by counting tree rings? Correct! Correct!
Image of page 14
3/31/2019 RockOn #10: GEOSC 10 Spring 2019, Merged 15/15 Quiz Score: 15 out of 15
Image of page 15

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture