The Welden Limestone is a geologic formation in Oklahoma.
 It preserves fossils dating back to the Carboniferous period.
 It is restricted to the Lawrence Uplift of southern Oklahoma.
 In this region, the Welden
The Locust Point Formation is a geologic formation in Indiana.
 It preserves fossils dating back to the Carboniferous period.
The Kapp Starostin Formation is a geologic formation in Norway.
 The layers span around 27 million years of the Permian period; and it preserves fossils dating back to the Carboniferous period.
The Minturn Formation is a geologic formation in Colorado.
 It preserves fossils dating back to the Carboniferous period.
 Among the fossils preserved are of crinoids, spiriferid brachiopods, gastropods, and the spines and teeth of numerous sharks such as Petalodus
The Lawrence Shale is a geologic formation in Kansas.
 It preserves fossils dating back to the Carboniferous period.
Mount Oread is a hill in Lawrence, Kansas upon which the University of Kansas is located.
 It sits on the water divide between the Kansas and Wakarusa rivers.
 It was named after the Oread Institute in Worcester, Massachusetts.
 The hill was originally called Hogback Ridge by many Lawrence residents until the Oread name was adopted in 1866.
The Shelburn Formation is a geologic formation in Indiana.
 It preserves fossils dating back to the Carboniferous period.
The Deseret Limestone, also known as the Pine Canyon Formation, is a geologic formation in Utah.
 It preserves marine fossils dating back to the Carboniferous period or Mississippian age.
 It was formed by the Panthalassa ocean around 340 Ma.
 Fossils are mostly of tabulate and rugose corals, and other marine invertebrates; vertebrates are represented by conodonts.
 The Deseret is a 500-foot thick layer of dolomitic limestone with chert, with a basal layer of black shale that is host rock for many Utah caves such as Timpanogos Cave National Monument.
The Mansfield Formation is a geologic formation in Indiana.
 It preserves fossils dating back to the Carboniferous period.
The Oread Limestone is a geologic formation of the Shawnee Group exposed in Kansas, Nebraska, Missouri, Oklahoma, and Iowa.
 The type locality is Mount Oread within Lawrence, Kansas.
 It preserves fossils dating back to the Carboniferous period.

Question: This geologic formation with fossils dating back to the Carboniferous period was originaly called what by many Lawrence residents?
Answer: Hogback Ridge