新疆西准噶尔地区泥盆-石炭系界线附近的腕足动物(长身贝类、无窗贝类及穿孔贝类)

PRODUCTIDE,ATHYRIDIDE AND TEREBRATULIDE BRACHIOPODS ACROSS THE DEVONIAN-CARBONIFEROUS BOUNDARY IN WESTERN JUNGGAR,NORTHWESTERN CHINA

新疆西准噶尔沙尔布尔提山地区泥盆系—下石炭统发育良好,各门类海相生物化石众多,尤以腕足类化石最为丰富。根据对采自该地区3个剖面(布龙果尔剖面、和布克河剖面、俄姆哈剖面)上腕足类的详细研究,系统描述长身贝类4属4种,无窗贝类2属3种,穿孔贝类2属2种,穿孔贝类(Dielasma cf.D.? utah(Hall and Whitfield),Cranaena cf. hannibalensis Moore)为该地区首次报道。除无窗贝类Cleiothyridina cf. kusbassica Besnossova在俄姆哈剖面可延续进入下石炭统之外,其余属种皆产自上泥盆统。上述腕足动物属于Syringothy-ris-Spirifer动物群的重要分子,时代为晚泥盆世—早石炭世,大致对应于牙形石中praesulcata带至sandbergi带(法门最晚期—早石炭世)。上述腕足动物群在组成上与北美、乌拉尔地区及库兹涅茨盆地的化石组合较为相似。

Devonian and Lower Carboniferous strata are well-developed in the area of the Shaerbuerti Mountains , in the western Junggar region of Xin-jiang.They bear abundant marine fossils , especially brachiopods.In the present paper , four genera and species of productides , two genera and three species of athyridides and two genera and species of terebratulides are described from three sections ( Bulongguoer , Hebukehe , and Emuha ) .The tere-bratulides ( Dielasma cf.D. ? utah ( Hall and Whitfield ) and Cranaenacf.hannibalensis Moore ) are reported from this area for the first time.The brachiopods are important components of the Syringothyris-Spiriferassemblage.Cleiothyridi-nacf.kusbassica Besnossova is the only taxon that extends into the Lower Carboniferous in the Emu-ha section and all others were discovered from the Upper Devonian. The age of the assemblage approximately corresponds to the Middle praesul-cata-sandbergi conodont zones ( latest Famennian-Early Carboniferous ) .The brachiopod fauna is similar to contemporaneous faunas of North America , the Urals , and Kuznetsk Basin.