Palynology of the Chigua (Devonian) and Maliman /rarboniferous) formations in the Volcan Range, San Juan province, Argentina. Part II. Cavate, pseudosaccate and cingulizonate spores

摘要

Palynological analysis of the Chigua and Maliman formations of Middle Devonian and r sissippian age respectively, is presented. They crop out in the Del Volcan Range at the Rio Blanco -in in western Argentina In this second part, 40 indigenous species of cavate, pseudosaccate and cin-H7onalo spores from both units aie illustrated. The species Geminospora sp. cf, G. tuberculata var. tuber-u/ijto McGregor is recorded in the Middle Devonian of South America for the first time. The following TCU'S 'iiv als0 recorded in the Mississippian of South America for the first time as Crassispora invicta Plavford, Densosporites asperus Braman and Hills, Densosporites gracilis Smith and Butterworth, QCi,nKwiles secundus Playford and Satterthwait, Densosporites sp. cf. D, triangularis Kosanke, Gorgonispom sn ii. G. i rassa (Winslow) Higgs et ah, Lophozonotriletes dentatus Hughes and Playford, Spelaeotriletes echi-nalin- (H.nquebard) Utting, Velamisporites perinatus (Hughes and Playford) Playford. Some possibly reworked species (scolecodonts, paleomicroplankton and spores) from the Maliman Formation are illustrated and some of them are also described.