SANDUSKY Bay AND CEDAR POINT 209 
Gypsum has been quarried near the north shore of the bay, 
3 miles west of the Bay Bridge, for about three quarters of a 
century. At first it was ground by a windmill, but about 1835 
by a steam mill. Thirty-ton schooners anchored a mile out in 
the bay and loaded for Detroit, Erie and other ports. This is 
said to have been the only locality on the Lakes where plaster 
was obtained at that time. The gypsum beds lie mostly below 
lake level. Long ago about four acres of the bay at Plaster 
Beds were diked off, the water pumped out and gypsum quarried. 
A few years ago one of the plaster companies operating at 
Fletcherville several miles west of Plaster Beds mined gypsum 
Map VI. 
Rock between Sandusky and Cedar Point. Figures give depth in 
feet and tenths below 0 of water gage. — indicates rock was not reached, 
but, if following a number less than 21, was probably within one foot. 
