110 



L.R.M. COCKS AND ZHAN REN-BIN 



INTRODUCTION 



During the early 1970s the then Institute of Geological Sciences of 

 Great Britain (IGS) undertook field work on behalf of the United 

 Nations in the Shan States, Burma (a country often now termed 

 Myanmar) with the prime aim of establishing the nature and eco- 

 nomic prospects of lead-zinc-silver mineralisation of the area. The 

 rocks studied were Cambrian to Cretaceous in age, with substantial 

 igneous intrusions, and included the Ordovician Naungkangyi Group 

 and its equivalent rocks from which came the brachiopods described 

 here. These were collected by the IGS survey teams, in particularly 

 A. H. G. Mitchell and B. J. Amos, and sent to the Natural History 

 Museum, London, for identification amongst other faunas. The 

 results, including the preliminary identifications of the brachiopods 

 by one of us (LRMC) were published in two memoirs and accompa- 

 nying geological maps: Garson, Amos & Mitchell ( 1976) for parts of 

 the Southern Shan States (AM and BA in Fig. 1) and Mitchell etal. 

 (1977) for parts of the Northern Shan States (AM, TM andYA in Fig. 

 1 ). The Naungkangyi Group faunas had also been collected in the 

 early years of the century by the Indian Geological Survey, summa- 

 rised by La Touche (1913), and the brachiopods published in four 

 papers by Reed (1906, 1915, 1932 and 1936); however, Reed 

 described them somewhat in isolation from contemporary faunas in 

 adjacent parts of Asia. The purpose of the present paper is to 

 reidentify and partially redescribe the Naungkangyi brachiopods in 

 the light of modern brachiopod studies, and to compare them with 

 nearby areas, in particular South China. 



BRACHIOPOD FAUNA OF THE 

 NAUNGKANGYI GROUP AND EQUIVALENTS 



There follows a list of the fauna which we recognise from the 

 Naungkangyi Group and its equivalents. Those taxa with an asterisk 

 (*) are recorded and figured by Reed (1906, 1915, 1932 and 1936) 

 but were not recollected by the IGS team, and are included here only 

 on the basis of our interpretation of Reed's figures. Reed's original 

 attributions are given in square brackets. 



*Lingulella sp. [Lingula cf. quadrata: 1906: 49, pi. 4, fig. 1]. 

 *Palaeoglossa? sp. [L. cf. attenuata: 1915: 8, pi. 2, fig. 5]. 

 *Schizotreta sp. [Schizotreta cf. elliptica: 1906: 50, pi. 4, figs 2, 



2a]. 

 Plaesiomys taungtalensis (Reed, 1936) [Orthis (Dinorthis) 



flabellulum: 1906: 62, pi. 4, figs 4-6]. 

 * 'Plaesiomys sp. [O. (Dinorthis) porcata birmanica: 1915: 10,pl. 



2, figs 12-13]. 

 *Glyptorthis sp. [O. (Glyptorthis) sp.: 1936: 25, pi. 1, fig. 24]. 

 Nicolella sylvatica (Reed. 1 936) [O. (Hesperorthis) cf. laurentina: 



1936: 20, pi. 1, fig. 15; O. (Wattsella? ) pontilis: 1936: 27, pi. 2. 



figs 5-7]. 

 Nicolella sp. [O. (Nicolella) cf. actoniae: 1936: 29, pi. 2, fig. 9]. 

 */V. sp. [O. (Plectorthis) cf. dichotoma: 1936: 20, pi. 1, fig. 23]. 

 *N. liberalis (Reed, 1936) [O. (Eridorthis) liberalis: 1936: 22, pi. 



1, figs 3, 3a, 4; O. (E.) kalavensis: 1936: 23, pi. 1. figs 1-2]. 



Fig. 1 Location map of Shan States. Burma (Myanmar). with dotted blocks showing the main areas of IGS mapping, which include AM. BA. TM and YA. 

 the prefixes to the new fossil localities and collections described here. 



