Bridge of Sighs (Oxford) Bridge of Sighs (Oxford) Hertford Bridge, often called "the Bridge of Sighs", is a skyway joining two parts of Hertford College over New College Lane in Oxford, England. Its distinctive design makes it a city landmark. The bridge is often referred to as the Bridge of Sighs because of its supposed similarity to the famous Bridge of Sighs in Venice. However, Hertford Bridge was never intended to be a replica of the Venetian bridge, and instead it bears a closer resemblance to the Rialto Bridge in the same city. There is a false legend saying that many decades ago, a
Greenhorn Limestone recognized in the Great Plains Region from Minnesota and Iowa to New Mexico to Montana and the Dakotas. In much of Alberta and Saskatchewan, the "Second White-Specked Shale" contains limy equivalents of the Greenhorn. In Kansas, the Greenhorn Formation is divided into the (lowest) Lincoln Limestone, Hartland Shale, Jetmore Chalk, and (highest) Pfeifer shale members, each noted by changes in chalkiness and limestone rhythmite patterns. In Colorado and western Kansas Hydrocarbon exploration, the divisions are Lincoln Limestone, Hartford Shale, and Bridge Creek Limestone. In other states, where the formation is less developed, the unit is not subdivided and is named