Field, laboratory, and library manual in physical geography . Fig. 23. Map of the Ancient Lake Bonnevillewith its Modern Representatives, Great SaltLake and Sevier Lake 134 PHYSICAL GEOG-EAPHY MANUAL EXERCISE LI EXTINCT LAKES Refer to the map, Fig. 23. What is the length in miles ofGreat Salt lake ? What was the greatest length of Lake Bonne-ville, according to this map ? Give the evidences, so far as youknow them, which go to show that Great Salt lake is a remnantof Lake Bonneville. Was this change in size due to drainage,filling, or evaporation? How do you know? If Lake Bonne-ville was a fre
Field, laboratory, and library manual in physical geography . Fig. 23. Map of the Ancient Lake Bonnevillewith its Modern Representatives, Great SaltLake and Sevier Lake 134 PHYSICAL GEOG-EAPHY MANUAL EXERCISE LI EXTINCT LAKES Refer to the map, Fig. 23. What is the length in miles ofGreat Salt lake ? What was the greatest length of Lake Bonne-ville, according to this map ? Give the evidences, so far as youknow them, which go to show that Great Salt lake is a remnantof Lake Bonneville. Was this change in size due to drainage,filling, or evaporation? How do you know? If Lake Bonne-ville was a fresh-water lake, how do you account for the salt-ness of Great Salt lake ? According to the map, Fig. 24, how far beyond its presentlimit did the Gulf of California extend? How far was themouth of the Col-. orado river fromits present mouth?The delta wasbuilt up, thus cut-ting off the headof the gulf. Theriver followed oneof its distributariesto the lower por-tion of the the newlymade lake salt orfresh ? Rainfall isvery light in thisregion, averagingfrom 2 to 5 inchesannually; evap-oration is veryrapid. Would time make this lake more or less salt? Except for an occasional overflow of the Colorado river,this region at present is entirely dry. What do you supposehas become of the salt? In what part would it probably be Fig. 24. Map of the Bed of the Ancient Salton Sea,about 300 Feet below Sea Level, showing the Proba-ble Former Extent of the Gulf of California and theDelta of the Colorado River SOLIDS IN SOLUTION 135 found in the largest quantities? Do you think this part wouldmake good agricultural land? Why? Some remarkably fertilesoil is found near the Mexican boundary line and in the south-ern portion of this old lake bed. Explain why it is for irriga-tion is bro
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