sentences:  According to some geologists from that time, Tomkins Cove had the purest limestone formation in the world, except for certain deposits in Russia.The Hudson River National Defense Fleet established by an act of Congress in 1946, was first located off Tarrytown, one of eight anchorages in the United States to provide a sizable group of merchant ships to support the military effort at the outset of any war.On April 30, 1946, the Hudson River fleet was moved further north to Jones Point (at one time known as Caldwell's Landing) at the foot of Dunderberg Mountain.