Geol. A name given (attrib., or ellipt. as sb.) to a limestone formation exemplified at Trenton Falls, New York, and hence to the group or series of Lower Silurian rocks to which it belongs.
1854. Murchison, Siluria, xvi. 413. From the ‘Potsdam sandstone’ … up to the slates and arenaceous schists over lying the Trenton limestone, the group so composed represents the Lower Silurian.
1873. Dawson, Earth & Man, iv. 59. The Trenton.
1885. Lyell, Elem. Geol. (ed. 4), 445. The Hudson River Group, and the Trenton Limestone, agree palæontologically with the Caradoc or Bala Group.
