Map of southeastern Pennsylvania and eastern Maryland showing sedimentary rocks of Newark group, and dikes and sills of diabase which intrude both the Newark group and the earlier crystalline and sedimentary rocks of surrounding areas. King 1959, p. 51.

Map of the distribution of bedrock types beneath and surrounding the southern end of Lake Michigan, of the dominant direction of ice flow and of the localities where counts were made of pebbles in the glacial till(Valparaiso). Below is a plot of the distribution of pebble types with respect to the sample sites. Note the strong relationship between the type of predominating pebble and the proximity to bedrock of the same composition (Dapples, 1959, p. 412).

Map shapes of end moraines (Gripp, 1955, p.42).

Map showing extent of present permafrost (Black, 1954, fig. 1).

Map showing the distribution of the elephants at the present time (solid black), their distribution in the past and the probable directions of their dispersal.

Earthquakes. Map showing the distribution of the epicentres of recent earthquakes. Heavy shading indicates the occurrence of frequent earthquakes, including most of those of major intensity. Holmes, 1953, p. 366.

Loess. Map showing the distribution of loess deposits in cnetral United States and their relationship to rivers that carried glacial meltwater during the retreat of the great continental glaciers of the Pleistocene (Zumberge 1958, p. 125).

Map indicating (in dotted areas) the extent of outcrops of Karroo formation (Upper Carboniferous to Jurassic) in South Africa and analogous continental formations in Equatorial Africa (Gignoux 1955, p. 242).

Map showing the large modern lakes in black which are the remnants of the largest single body of fresh water ever to cover the North American continent, Lake Agassiz. This body of water formed as the retreating Wisconsin ice sheet released large quantities of meltwater. Lake Agassiz discharged first down the Minnisota River which joins the Mississippi River at Minneapolis and St. Paul. Later, however, the ice retreated farther north and uncovered a lower outlet to Hudson Bay (Zumberge 1958, p. 355).

Marble quarries near Carrara, Italy.

Margin of lava flow of 1875, Nyjarhaun, east of Myvatn. August 5, 1960.

Marine cliff with pebble beach in front. Note beach cusps, poorly developed. Black material on beach is kelp. Note contact between White Chalk, Sevonian, below and Danian limestone above. Stevns Klint, Island of Sjaelland, Denmark. Monday, August 22, 1960.

Marl exposure along river bank. North side of Sturgeon River about 300 feet west of bridge on south end of Sturgeon Lake, Sask.

Mars. Note ice cap.

Mastodon and mammoth teeth. Above, a sideview of a tooth of a mastodon showing the paired cusps; below, a top vier of a tooth of an elephant or mammoth showing the infolding of the enamel to strengthen the tooth for grazing. The scales are in centimeters (After Clark and Stearn, 1960, p. 375).