Answer Happy

Practice Exercise from which it came. Interbedded sequences (thin layers of two rock types repeating after the other) may be found where one facies grades into another. For example, a reef sequence may have shale interbedded within it due to slight sea level fluctuations. Mixed beds may also be found, such as clayey sand or sandy shale, where one facies grades into another. For this exercise, you will reconstruct an ancient environment by looking at hand samples and identifying the environment Samples were collected from each of the areas that are numbered, which are stream cuts and road cuts. "UN" represents an unconformity, signifying land. It is known that all of the rocks collected represent the same geologic age. Identify the rocks found at each site, determine the environment in which it was deposited, and reconstruct the ancient environment by grouping like environments. A practice exercise has been provided below. Environment/ facies Location Rock type / fossils 1 broken, crushed shells 2 clean white sandstone 3 green shale, gastropods limestone 5 black shale, chert 6 peat, coal 7 plant remains 8 unconformity 9 brown shale, gastropods 10 limestone, coral 1 . 4 UN 3 UN 7 6 10 8 9 2 UN