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The Upper Ordovician is extensively distributed in the Central China Region, containing rich and varied graptolites. During the recent several decades, a great amount of stratigraphical and graptolitic data have been accumulated. However, due to the limit of space, this book only adopts more than 27 sections to discuss the problem on the stratigraphical stratify, division of graptolite zones and their correlation of the Upper Ordovician in the Central China Region and boundary between Ordovician and Silurian . This book also deals with the problem on the biostratigraphical division of the Upper Ordovician. Here described are the graptolites from the Upper Ordovician of the Central China Region, including 33 genera and 192 species or subspecies; 2 new genera and 69 new species or subspecies are erected. On the basis of the description, also discussed are the problem on the characteristics of Late Ordovician graptolite fauna, classification of certain graptolites and the reticulated structure of the rhabdosome. The Late Ordovician palaeographic maps of the Central China Region have been published in separate papers.
1. Dendroidea Nicholson, 1872
(1) Dendrograptidae Roemer, in Frech, 1897
(2) Ptilograptidae Hopkinson, 1875
(3) Inocaulidae Ruedemann, 1947
(4) Incertain in taxonomical position
2. Graptoloidea Lapworth, 1875
(1) Axonolipa Frech, 1897
1) Nemagraptidae Lapworth, 1873
2) Dicranograptidae Lapworh, 1873
(2) Axonophora Frech, 1897
1) Diplograptidae Lapworth, 1873
2) Hallograptidae Mu, 1950 (= Lasiograptidae Bulman, 1955)
3) Reteogaptidae Mu, 1974
4) Archiretiolitidae Bulman, 1955; emend. Mu, 1974
5) Dimorphograptidae Elles et Wood, 1908
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