. Bulletins of American paleontology. Bulletin 342. Text-figure I. — Index map showing collecting localities. The inset shows details of sections from which samples were collected in the Snowblind Creek area (loc. 1) during the 1990 field season. to their extinction in mid-Ludlow time. This diversi- fication of the plectograptines during the latest Wen- lock and earliest Ludlow coincided with a distinct drop in monograptid diversity. ACKNOWLEDGEMENTS This study was greatly facilitated by the field assis- tance and support through the years of a number of individuals, among them B. Chatterton,
. Bulletins of American paleontology. Bulletin 342. Text-figure I. — Index map showing collecting localities. The inset shows details of sections from which samples were collected in the Snowblind Creek area (loc. 1) during the 1990 field season. to their extinction in mid-Ludlow time. This diversi- fication of the plectograptines during the latest Wen- lock and earliest Ludlow coincided with a distinct drop in monograptid diversity. ACKNOWLEDGEMENTS This study was greatly facilitated by the field assis- tance and support through the years of a number of individuals, among them B. Chatterton, K. Dewing, J. Hill, J. Jin, A. McCracken, D. Perry, S. Senior, and J. Shaw. Special thanks go to M. Melchin who acted as assistant on a number of occasions and who subse- quently independently collected, and generously do- nated, graptolite-bearing nodules. Most of the studies of plectograptine graptolites were carried out while I was on sabbatical leave at Trinity College, Dublin. The support of the Department of Geology at that insti- tution, and particularly of C. H. Holland, is particularly acknowledged. Appreciation is also expressed to the faculty and technical staff of that Department, as well as to D. John and C. Reid of the Trinity College Elec- tron Microscopy Unit, for the many kindnesses and assistances while at Trinity. A. Pratt operated the Scan- ning Electron Microscope at Surface Science Western, University of Western Ontario, and his fine services were much appreciated. H. Jaeger, Berlin, generously shared some of his knowledge and information on plec- tograptines in his collections, and provided a photo- graph and line drawings of some; T. Koren, St. Pe- tersburg, supplied range charts of late Wenlock graptolites. including plectograptines, in her collec- tions; and A. Kozlowska-Dawidziuk, Warsaw, provid- ed an SEM photograph of a long specimen of Gotho- graptus eisenacki Obut and Sobolevskaya, 1965. N. H. K_irk and D. E. B. Bates readily shared their under-
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