Abstract In the 1930s, Alfred Bentz, August Moos and Karl Krejci-Graf were among the most noteworthy petroleum geologists in Germany. Being scientific modernists, they systematized the search for oil, introducing modern exploration methods. All three, at some stage, worked for the German state on providing the petroleum needed by the German military during World War II. The three colleagues seem to have had an amicable relationship. They were, however, very different. Bentz was not a member of the National Socialist party but obviously lent his expertise to the regime; as did Krejci-Graf, who, although also was not a party member, was a member of the SS, whereas Moos, due to his Jewish background, was murdered in January 1945 in the concentration camp of Buchenwald. This paper endeavours to sketch the lives of the three colleagues, highlighting their relationship and the interconnectedness of contemporary moral issues with professional and scientific demands.

Abstract The siege of Petersburg and Richmond during the American Civil War in 1864–1865 provides a stellar example of how geology can affect military operations and thus the course of history. During the Union drive to take the Confederate capital, they used Virginia’s broad tidal rivers on the Atlantic Coastal Plain as supply lines for their huge army. During the siege, both sides took advantage of the unconsolidated Cenozoic sediments of the Coastal Plain to create a new style of combat—trench warfare—which would be taken to horrifying extremes in World War I. This trip visits seven sites of both historic and geological significance in the Petersburg area.

Abstract This guidebook chapter outlines a walking tour that provides an introduction to the geological, archaeological, and historical setting of Pittsburgh, with an emphasis on the use of local and imported geologic materials and resources in the eighteenth and nineteenth centuries. The focus is on downtown Pittsburgh, the low-lying triangle of land where the Monongahela and Allegheny Rivers join to form the Ohio River, and Coal Hill (Mount Washington), the escarpment along the Monongahela River to its south. Topics include the importance of—and concomitant effect of—historic coal use; use of local and imported geologic materials, including dimension stone used for buildings and gravestones, and chert used for gunflints and millstones; the frontier forts built at the site; and the ubiquitous landslides along Coal Hill.