SaratogaSprings, New York,is the site of one of the finestexamplesof domed stromatolites to be seen anywherein ancient rocks and is significantin the history of geology as the area where stromatolites were first described and interpreted. These cabbage-head structures,which arepart of the Hoyt Limestone of Late Cambrian(LateFranconianto Early Trempeleauan) age, were describedby James Hall as early as 1847. Glaciated surfaces expose horizontal sections of the cabbage-shaped heads composed of vertically stacked, hemisphericalstromatolites. The microbialheads are discretedomalstructures built of hemispheroidal and bulbousstromatolitesexpanding upward from a base. The heads, many of themcompound, are circularin horizontalsection, and range in diameter from a few centimeters to a meter. Between the heads are ooids, skeletal fragments of trilobites, brachiopods, pelecypods, and quartz-sandparticles.The earliest reference to stromatolitesin this area was that of Steele (1825) whose descriptionincluded the first reported oolitic limestone in North Americaamong which the stromatolites occur. The depositional environmentwas that of a peritidalsetting involvingoolite shoals, lagoons, and intertidal flats.