Species of the Genus Schwagerina and Their Stratigraphic Significance.

Austin: The University of Texas, 1924. [University of Texas Bulletin, No. 2433: September 1, 1924]. Octavo, paperbound (printed grey wrappers), 98 pp. Very Good+, with lightly rubbed edges & age darkening. From Introduction: Species of the genus Schwagerina occur in most of the outcropping limestones formed in the open, connected, epicontinental seas existing at the time of the initiation of the Permian fauna and flora. They are highly organized formainifera, of large size, and they occupy a limited thickness of rocks. They thus form valuable horizon markers wherever they occur...It is the purpose of this paper to describe the known specieis of the genus Schwagerina; to discuss their relationships with the other Fusulinae; their distribution throughout the Northern Hemisphere, and the analysis and correlation of the faunas with which they are associated.