University of South Florida



57150-960755Name: 00Name: 66675-608330Date: 00Date: Geology Unit LabProcedure: In this activity you will examine samples of sediments and rocks from Florida. The properties of these samples can help us to determine their histories and origin, and clues to what the Florida coast and its sea level were like in the past.Make the following observations of the samples and record them in the chart.Sediments: You will identify color, size in mm, Wentworth Class (based on the size), texture, sorting, composition, presence of shell material, and depositional environment based on the characteristics of the sample.Rocks: You will identify color, composition, presence of shell material, and depositional environment based on the characteristics of the sample and the information provided in the Vocabulary section.Color: What color or colors is the sample? If there is more than one color, note which one is most prevalent.Size: You can measure the size of the particles by using a metric ruler or putting the sample on a sheet of metric graph paper and comparing the size of the particles to the size of the squares. If the particles are smaller than one square, divide the size of the square by the number of particles that fit in it.Wentworth Scale: Using the size that you determined classify the particles using the Wentworth scale below.Wentworth ScaleGrain DiameterClassificationGreater than 256 mmBoulder64 to 256 mmCobbles2 to 64 mmPebbles (or Gravel)1/16 to 2 mmSand1/256 to 1/16 mmSiltMudLess than 1/256 mmClayTexture: This is a measure of how round the particles are. Compare the particles in the sample to the pictures in the illustration below to determine the roundness of the particles in your sample. Sorting: The sample sediment could have particles that are mostly the same size or vary in size. Sorting is a measure of how much they are the same or different. Compare your samples of sediment to the pictures in the illustration below to determine the sorting of the particles in your sampleComposition: What types of materials make up the sand in your sample? Are they minerals, rocks, or organic materials? Most sand in Florida is made of silica or calcium carbonate. To see which it is put a drop of dilute hydrochloric acid on the sample and observe what happens. If it bubbles, it is most likely calcium carbonate or has a combination of silica and calcium carbonate grains (shell material). If it doesn’t, it is most likely silica.3810-1212850Name: 00Name: 8255-829310Date: 00Date: Sample NumberSample Collected FromColorSize (mm)Wentworth ClassificationTexture (Roundness)SortingComposition (Calcium carbonate, silica, or both)Shell MaterialY/NDepositional Environment1SedimentFt. Pierce,East Coast of Florida, Central FL2SedimentFt. Pierce,East Coast of Florida, Central FL3SedimentFlorida Keys4SedimentFlorida Keys5SedimentPensacola, West Coast of Florida, Panhandle FL6SedimentFt. De Soto, West Coast of Florida, Central FLSample NumberSample Collected FromColorSize (mm)Wentworth ClassificationTexture (Roundness)SortingComposition (Calcium carbonate, silica, or both)Shell MaterialY/NDepositional Environment7RockSouth Hutchinson, East Coast of Florida, South FLNANANANA8“Unknown”_____Below is a map of the state of Florida; label each of the collection sites and which sample #’s were collected at each site. 285750025336500Look at the locations of each of the sediments, how do they differ based on the region, which they were collected?What factors besides location contribute to the differences in these sediment samples?Input data for “Unknown Sample #8” into your chart, based on your data, which region do you infer this sample came from? Be sure to provide three pieces of evidence to support your claimCompare what you found for the location and characteristics of the unknown sample with another group, Are they the same or different, explain?Do you think you need to revise your original conclusion about the unknown, why? ................
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