Location The Cambrian to Lower Ordovician stratigraphic sequencein northwestern Vermont outcrops in a north-south trending beltbordered on the east by the Green Mountain anticlinorium and on the west by deformed Middle Ordovician shales. Significantfacies changes, both parallel and perpendicular to depositionalstrike, can be observed between Burlington and U.S. 2, 8 mi (13 km) to the north (Fig. 1). Stops 1 to 5 in the Lower Cambrian Dunham Dolomite, Middle Cambrian Monkton Quartzite, and Winooski Dolomite are located on a 3 mi (5 km) west-to-eastseries of outcrops along U.S. 2 near Milton, starting in an abandonedquarry on the north side of the road, 5 mi (8 km) east of the Sand Bar State Park. The section continues 0.9 mi (1.5 km) farther east along U.S. 2 at a large roadcut on the north side of U.S. 2 (Stop 2), and again another 0.8 mi (1.3 km) farther along Route 2 at a roadcut on the south side of the road (Stop 3). Thefinal two stops along U.S. 2 are another 0.8 mi (1.3 km) (Stop 4) and 0.8 mi (1.3 km) (Stop 5, Chimney Comers). Total mileagealong U.S. 2 is 3.3 mi (5.3 km). Stop 6 is located along the Winooski River in downtown Winooski, Vermont, where thesupra-to-intertidal and shallow subtidal facies of the Monkton, Winooski, and Danby Formations are exposed. All outcrops areaccessible by car; access does not require permission.