In this paper Euclidean and hyperbolic discontinuous isometries* are discussed and compared. The graphic artist M.C. Escher (1898-1972) produced works which have for the structure points, lines, and angles, which repeat in the plane (Euclidean and...
The Brian Head Formation represents the first widespread pulse of volcanism in the Tertiary of southwestern Utah. In the Casto Canyon area, about 20 km north of Bryce Canyon National Park, silicified beds are found within the upper part of the...
