Two field trips were made to study the supposed unconformity between Mississippian Redwall Limestone and Cambrian Muav Limestone along the North Kaibab Trail, Grand Canyon. Characteristics indicative of unconformable stratigraphic relationships are described. Such characteristics were not observed along the Redwall/Muav contact line. Field evidence supports the belief that continuous deposition of sedimentary strata occurred, one formation on another. Thus there need not be any 200 million year depositional hiatus between the two formations.