| Show sinkholes dot alpena michigan section cause of phenomena remains a mystery if reporters and photographers had been on the job in alpena some centuries ago it is probable the same sort of news stories coming from a western state telling of farms sinking and more feet would have been written under A al pena date lines says a correspond ent in the detroit free press the depressions are still in evi dence the famous sinkholes of al pena presque isle and mont morency counties the three coun cour ties have 37 of the sinkholes from to feet deep many with walls so sheer they can t be climbed rock strata exposed for easy study draw numerous geologists and inspire frequent scientific papers scientists do not agree on the causes of the depressions but it is generally believed that the sinkholes were originally enormous deep caa erns in the limestone the roofs are believed to have caved in caus ing the sinkholes one of the sinkholes is believed to be under water in misery bay fish ermen report that when water is high in the rivers they find their boats drifting away from one spot in the bay when the rivers are low their boats drift toward the spot as though water from the lake was being drawn through an under ground river some of the sinkholes are dry and others are filled with water local belief is that some of the holt hos holts s are bottomless no soundings ever hav ing been taken on the bottom As the depth of the water remains stationary in some despite heavy rainfalls or local conditions it is presumed that the sinkholes con hect with underground rivers sto nes ries of marked logs being dropped into sinkholes sucked beneath the surface and reappearing in lake huron are discounted by those who have studied the phenomena |
