ABSTRACT This renewed palynological study of the Mount Johnstone Formation, at Balickera in the Hunter Valley region of New South Wales (eastern Australia), discloses a considerably more diverse palynoflora – termed the Grandispora maculosa Assemblage – than was reported in 1968. Represented are some 51 species of palynomorphs, comprising 46 species of trilete spores (distributed among 27 genera), three species of monolete spores (three genera), one species of hilate spores, and a single algal-cyst species. The following species are newly instituted: Verrucosisporites adgeratus, V. johnstonense, V. pavimentatus, Anapiculatisporites robertsii, Convolutispora perplicata, Knoxisporites balickeraensis, Densoisporites argutus, Laevigatosporites demutabilis, and Latosporites durabilis. Quantitatively important and/or consistently represented species include Reticulatisporites magnidictyus (particularly), Punctatisporites spp., Verrucosisporites spp., Rattiganispora apiculata, Grandispora maculosa, Indotriradites kuttungensis, Velamisporites australiensis, Laevigatosporites demutabilis, and Psomospora detecta. The absence of marine palynomorphs supports the previously envisaged, predominantly fluvial deposition of the Mount Johnstone Formation. Key palynostratigraphic indices, in conjunction with absolute-age determinations obtained from sub- and suprajacent rocks, indicate that the G. maculosa palynoflora and its hosting Mount Johnstone strata are Mississippian – specifically middle–late Visean – in age. This dating also applies to similarly palyniferous deposits in the northern Perth and Carnarvon basins of Western Australia. Beyond Eastern Gondwana, equivalents of the G. maculosa association have been reported from Western Gondwana (Brazil and Argentina in particular) and, to a lesser extent, from Northern Gondwana, thus attesting to its wide distribution and chronostratigraphic significance within the supercontinent and its distinctiveness vis-à-vis Euramerican regions.

中文翻译：

---

澳大利亚新南威尔士州新英格兰造山带南部约翰斯通山地层（密西西比州）的孢粉学

摘要 对位于新南威尔士州（澳大利亚东部）猎人谷地区巴利克拉的约翰斯通山地层进行更新的孢粉学研究，揭示了一种比 1968 年报道的更多样化的孢粉植物群——称为 Grandispora maculosa Assemblage。代表了大约 51孢粉型种类，包括三线孢子46种（分布于27属）、单线孢子3种（3属）、单线孢子1种、藻囊单种。以下物种是新建立的：Verrucosisporites adgeratus、V. johnstonense、V. pavimentatus、Anapiculatisporites robertsii、Convolutispora perplicata、Knoxisporites balickeraensis、Densoisporites argutus、Laevigatosporites demutabilis 和 Latosporites。数量上重要和/或一致代表的物种包括 Reticulatisporites maggnidictyus（特别是）、Punctatisporites spp.、Verrucosisporites spp.、Rattiganispora apiculata、Grandispora maculosa、Indotriradites kuttungensis、Velamisporites australiensis、Personalisporites 海洋孢粉体的缺失支持了先前设想的约翰斯通山地层主要是河流沉积。关键孢粉地层指数与从下层和上层岩石中获得的绝对年龄确定相结合，表明 G. maculosa palynoflora 及其所在的约翰斯通山地层在年龄上属于密西西比纪——尤其是中晚期维森纪。这种测年也适用于西澳大利亚珀斯北部和 Carnarvon 盆地中类似的孢粉矿床。