The show starts with a rather bland easel-scale style of abstraction: Illinois, 1977, and Mohawkian
, 1980, are typical efforts, with their powdery matte grounds intruded upon by muscular shapes.
The Manheim is in the Diplacanthograptus spiniferus graptolite Zone and the Haldane is likely with the upper part of the Belodina confluens conodont Zone, which indicates the bed would be mid-Katian and latest Mohawkian
. The timing of volcanism is surprisingly close to the period of volcanic activity of the Taconic arc near the eastern margin of Laurentia.