The Pink Cliffs at Bryce Canyon (the Claron Formation) lie at the top of the Gra

Question

The Pink Cliffs at Bryce Canyon (the Claron Formation) lie at the top of the Grand Staircase. Evidence for a shallow lake at this location-50 million years ago includes one of the items on this list below. Please select the observation documented at Bryce Canyon. (One great source for reading all about it here: https: //en.wikipedia.org/wiki Geology_of_the_Bryce_Canyon_area#Claron_flood_plain_and_lake_system) Select one: a. A glacial moraine dammed river flow and created a lake b. limestone rich mud containing freshwater fossils c. marine fossils deposited into a lagoon by high tides d. Salt flats show where a shallow marine lake once evaporated Enjoy this video: https: //youtu.be/gj_dtyX1Lp8. What surface process created Chimney Rock, a neat and memorable landform in western Nebraska? Select one: a. millions of sedimentary layers that accumulated over time b. differential erosion that left behind only the strongest rock c. abrasion by wind shaped the sedimentary rocks into the unique landform Choose the most widely-accepted explanation leading to the demise of the Western Interior Seaway. Select one: a. The waters filled a low basin that slowly filled in by tons of sediment brought by rivers to the area. b. Mountain building uplifted the land and restricted the seaway to form a chain of lakes, which later filled in with sediment. c. The warmer climate caused ongoing evaporation until the seaway finally disappeared. What is a marine transgression? You will find these videos helpful: https: //www.youtube.com/watch?v AslbszrbE2g https: //www.youtube.com/watch?v=IuY5ozbURA Select one: a. A geologic event characterized by warmer climate and increased bacteria, which harm fish and cause them to move offshore b. A geologic event during which sea level rises relative to the land. Shorelines move onshore toward higher ground. c. A geologic event during which sea level falls relative to the land. Shorelines move toward lower ground offshore. d. A geologic event characterized by warmer climate and increased bacteria, which harms fish and cause them to move onshore

Explanation / Answer

12. Answer b: The chimney rock is formed about 535 million years ago. The process begins when the portion of the magma welled and cooled and solidified into a huge mass of granite deep below the surface. After that high temperature and pressure changed the granitic rock into gneissic rock. The winds, water and temperature eroded the exposed portions of the rock which is further weakened by joints and faults. As erosion continues the chimney appear to grow taller and also appear further isolated from the cliff face. So we can say that differential erosion left behind only the strongest rock.

13. Answer b:Western interior seaway is a huge inland sea that existed during cretaceous and split the continent of North America into two halves. At the end of cretaceous, a continuous mountain lifting phase known as Laramide orogeny was taking place that deposited the thick sequences of silt and sandstone while the low lying basins between them subsided. This causes the western interior seaway to gradually recede towards Gulf of Mexico.

14. Answer b:Transgression is an event in which the sea moves towards land. There is increase in sea level with respect to the land or the land subsides both causes shorelines to move onshore towards higher land.

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