Date of Award
Master of Arts (MA)
Dr. George Engelmann
A scanning electron microscopic examination of Pennsylvanian conodonts has defined a total of eight discrete secondary surface features. These features are interpreted to have been formed by a toothlike in vivo functionality of elements within assemblages. Four general types of features have been identified and described. Attritional form 1 (AT1) features are easily detected due to the gross nature of the wear. These specimens exhibit AT1. Attritional form 2 (AT2) is of a subtle nature typically expressed as furrows and, at times, associated with irregular planer features. Two specimens exhibit this type of attrition. Attritional form 3 (AT3) is interpreted to represent repair, by growth lamellae addition, which has not totally removed visible evidence of damage. This form is considered intermediate between AT1 and AT2. One specimen exhibits AT3. Attritional form 4 (AT4) features are linear “gouges” which cross cut primary ornamentation features of denticles. AT4 is exhibited by two specimens.
Bave, Edwin Booth, "Evidence for attrition from certain Pennsylvanian conodonts." (1991). Student Work. 3293.
Files over 3MB may be slow to open. For best results, right-click and select "save as..."