Given in the table below are the values determined from the plot of the cumulative percent data on the probability graph. Use these values to calculate the Mean, Median, Sorting, Skewness, and Kurtosis from the Folk & Ward formulae listed in the lab exercise. Also complete what the numbers you calculate translate to in words.
Creek sand = quartz, rock fragment, micaceous sand from a creek near the Clarkston campus of Georgia Perimeter College.
Stream sand = quartz sand from the floodplain of the Ogeechee River near GA 88, Georgia.
Bahamas Beach sand = carbonate sand from the surf zone on Grand Bahama Island.
Bahamas Dune sand = carbonate sand from the back beach dune on the same beach as the Bahama Beach sand, Grand Bahama Island.
Florida Beach sand = quartz sand with shell fragments from the surf zone, Cape Canaveral Florida Beach.
Florida Dune sand = quartz sand from the back beach dune, Cape Canaveral Florida.
Tybee Island beach sand = quartz sand with some heavy minerals from the sand found above the high tide mark on Tybee Island, Georgia.
|
Phi |
Creek |
Stream |
Bahamas Beach |
Bahamas Dune |
Florida Beach |
Florida Dune |
Tybee I. beach |
|
5 |
-1.02 |
0.50 |
0.45 |
1.42 |
-0.62 |
0.38 |
2.04 |
|
16 |
0.89 |
1.13 |
1.08 |
1.70 |
0.00 |
1.02 |
2.27 |
|
25 |
1.15 |
1.30 |
1.22 |
1.82 |
0.17 |
1.24 |
2.38 |
|
50 |
1.58 |
1.62 |
1.50 |
2.06 |
0.53 |
1.70 |
2.62 |
|
75 |
2.00 |
1.97 |
1.81 |
2.26 |
0.90 |
2.20 |
2.85 |
|
84 |
2.25 |
2.20 |
1.95 |
2.33 |
1.08 |
2.48 |
2.97 |
|
95 |
2.75 |
2.72 |
2.21 |
2.51 |
1.45 |
3.05 |
3.30 |
|
Median |
1.58 |
||||||
|
Mean |
1.57 |
||||||
|
St. Dev. |
0.91 |
||||||
|
Skew |
-0.20 |
||||||
|
Kurtosis |
1.82 |
||||||
|
Median |
Med. Sand |
||||||
|
Mean |
Med. Sand |
||||||
|
Sorting |
Moderate |
||||||
|
Skew |
Negative |
||||||
|
Kurtosis |
Very Lepto |
Below you will find the sieve data for three samples of unknown depositional environment. Complete the data table for each by calculating the Weight of sand, Cumulative weight, Weight percent and Cumulative percent. Plot the weight percent data on graph paper as a histogram and frequency curve. Plot the Cumulative percent data on probability graph paper for the cumulative probability curve.
|
Screen Opening (phi) |
Weight of sand with beaker (grams) |
Weight of beaker (grams) |
Weight of Sand (grams) |
Cumulative Weight of sand (grams) |
Weight percent of sand |
Cumulative weight percent of sand |
|
-1 |
2.35 |
2.35 |
||||
|
0 |
2.44 |
2.36 |
||||
|
1 |
6.22 |
2.35 |
||||
|
2 |
17.70 |
2.34 |
||||
|
3 |
9.43 |
2.35 |
||||
|
4 |
3.00 |
2.36 |
||||
|
5 |
2.67 |
2.35 |
Total weight of Sieved fraction = 27.35 grams
Sample Description: Quartz sand from a Pliocene deposit in northwestern Florida.
|
Screen Opening (phi) |
Weight of sand with beaker (grams) |
Weight of beaker (grams) |
Weight of Sand (grams) |
Cumulative Weight of sand (grams) |
Weight percent of sand |
Cumulative weight percent of sand |
|
-1 |
2.34 |
2.30 |
||||
|
0 |
2.47 |
2.31 |
||||
|
1 |
2.96 |
2.33 |
||||
|
2 |
7.29 |
2.30 |
||||
|
3 |
25.60 |
2.31 |
||||
|
4 |
5.39 |
2.30 |
||||
|
5 |
2.36 |
2.28 |
Total Weight of Sieved fraction = 32.28 grams
|
Screen Opening (phi) |
Weight of sand with beaker (grams) |
Weight of beaker (grams) |
Weight of Sand (grams) |
Cumulative Weight of sand (grams) |
Weight percent of sand |
Cumulative weight percent of sand |
|
-1 |
2.52 |
2.30 |
||||
|
0 |
2.96 |
2.30 |
||||
|
1 |
5.44 |
2.31 |
||||
|
2 |
27.34 |
2.31 |
||||
|
3 |
7.09 |
2.30 |
||||
|
4 |
2.32 |
2.31 |
||||
|
5 |
2.31 |
2.31 |
Total Weight of Sieved fraction = 33.84 grams
From your Cumulative Probability graph from the unknown depositional environment data determine the these phi values and complete this data table by calculating the various values from the Folk & Ward formulae. Translate the values to words.
|
Phi |
Eocene of GA |
Pliocene of FL. |
Miocene of AL |
|
5 |
|||
|
16 |
|||
|
25 |
|||
|
50 |
|||
|
75 |
|||
|
84 |
|||
|
95 |
|||
|
Median # |
|||
|
Mean # |
|||
|
St. Dev. # |
|||
|
Skew # |
|||
|
Kurtosis # |
|||
|
Median word |
|||
|
Mean Word |
|||
|
Sorting word |
|||
|
Skew word |
|||
|
Kurtosis word |