Show 46 region as well as on the east side of Salt Lake valley and can be traced all along the west slope of the Yasatch Standing approximately 1000 feet above the present level of Great Salt Lake this line marks the highest point reached by that ancient body of water a level that must have been maintained for a great length of time before the lake found its outlet In prominence the Bonneville terrace is not the But its most distinct many terraces rival or surpass it excessive height above the present floor of the valley sets it apart as most outstanding The second great Bonneville Lake level is marked by the Provo terrace This was named because of the prominence it terrace surpassed in strength all the others and is clearly visible in many parts of the Bonneville Basin indicating that the lake maintained this level over an exceptionally extensive length of the Provo Delta which formed This of time line lies 375 feet below the Bonneville level — 625 feet above the present level of Great Salt Lake It is more recent than the higher terrace as shown by the nature of the sedimentary deposits13 The Provo shore During the Provo epoch the lake covered approximately 12 Gilbert Lake Bonneville 13 Loc cit 127 |