The Stratigraphy and Fauna of the Hackberry Stage of the Upper Devonian looks at the rocks of the Hackberry stage, which are exposed throughout a narrow belt in north central Iowa and constitute the uppermost member of the Devonian section. Although limited in area and in thickness, the Hackberry contains an abundant fauna, preserved with unusual excellence. A number of the species were described and illustrated in the publications of Hall, Hall and Whitfield, Hall and Clarke, Calvin, Webster, and others, but, at the time of this publication, most of them remained undescribed or erroneously...