Vol. 248, Issue 3, 1950

Science Paper
Structure and Origin of Two Windows Exposed on the Nittany Arch at Birmingham, Pennsylvania
Harold Dixon Fox
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Science Paper
The Volcano Purace
Victor Oppenheim
Purace is at present the only active vent of a group of Pliocene volcanoes at the northern edge of the Cauca-Patia batholith in the Cordillera Central of Colombia. . ....
Science Paper
A Molluscan Fauna From the Type Section of the Truckee Formation [Nevada]
Teng-Chien Yen
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Science Paper
The Fauna and Correlation of the McCraney Limestone of Iowa and Illinois
Merrill Addison Stainbrook
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Science Paper
Long Lost Meteoric Stones Recovered
Stuart H. Perry
Describes two perfectly preserved stones from the Girgenti meteorite which fell in Sicily, Italy, in 1853. Both specimens show the original fusion crust and the characteristic veined structure on broken...