Góis, F., Scillato-Yané, G.J., Carlini, A.A. & Guilherme, E. 2013. A new species of Scirrotherium Edmund & Theodor, 1997 (Xenarthra, Cingulata, Pampatheriidae) from the late Miocene of South America. Alcheringa 37, 175–186. ISSN 0311-5518. A new species of Scirrotherium Edmund & Theodor (Pampatheriidae) is described: S. carinatum. This genus was previously represented by a single species, S. hondaensis Edmund & Theodor, 1997, recorded from the middle Miocene (Laventan) of Colombia. Pampathere remains are common in the ‘Conglomerado osífero’ (late Miocene) of the Ituzaingó Formation in the Paraná River cliffs of Entre Ríos, Chubut (Argentina) and Acre (Brazil). All of them were referred to Kraglievichia paranense, and they are mostly osteoderms. However, only a few of these specimens are strictly consistent with that species. The new species described herein differs from S. hondaensis in having very thin osteoderms with more elaborate ornamentation. The movable band (or imbricate) osteoderms have a sculptured exposed surface and a single transverse row of anterior foramina; the lateral margins are wider and also bear foramina, and the longitudinal central elevation is long and proximally wide, and forms a posteriorly raised crest. This elevation is delimited by a fairly broad and shallow depression on each side, separating the marginal elevation from the longitudinal central one. The exposed surfaces of fixed (or fused) osteoderms bear large and deep anterior foramina, the longitudinal central elevation and delimiting depressions are very pronounced. This new species increases the known diversity of the pampatheres from the ‘Conglomerado osífero’. Additionally, a new nomenclatural scheme for Pampatheriidae osteoderms is proposed. Flávio Góis [goisf@fcnym]unlp.edu.ar], Gustavo Juan Scillato-Yané [scillato@fcnym.unlp.edu.ar], Alfredo Armando Carlini [acarlini@fcnym.unlp.edu.ar], Departamento Científico Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque, s/n, 1900, La Plata, Buenos Aires, Argentina and CONICET; Edson Guilherme [guilherme@ufac.br], Universidade Federal do Acre, Laboratório de Pesquisas Paleontológicas (LPP), BR 364, Km 04, 69.915-900. Rio Branco, AC, Brazil. Received 11.5.2012; revised 31.7.2012; accepted 4.9.2012. 相似文献
An oil‐bearing sandstone unit within the Monterey Formation is exposed in the Los Angeles Basin along the Newport‐Inglewood fault zone in southern California. The unit preserves structures, some original fluids, and cements that record the local history of deformation, fluid flow, and cementation. The structures include two types of deformation bands, which are cut by later bitumen veins and sandstone dikes. The bands formed by dilation and by shear. Both types strike on average parallel to the Newport‐Inglewood fault zone (317°–332°) and show variable dip angles and directions. Generally the older deformation bands are shallow, and the younger bands are steep. The earlier set includes a type of deformation band not previously described in other field examples. These are thin, planar zones of oil 1–2 mm thick sandwiched between parallel, carbonate‐cemented, positively weathering ribs. All other deformation bands appear to be oil‐free. The undeformed sandstone matrix also contains some hydrocarbons. The oil‐cored bands formed largely in opening mode, similar to dilation bands. The oil‐cored bands differ from previously described dilation bands in the degree of carbonate cementation (up to 36% by volume) and in that some exhibit evidence for plane‐parallel shear during formation. Given the mostly oil‐free bands and oil‐rich matrix, deformation bands must have formed largely before the bulk of petroleum migration and acted as semi‐permeable baffles. Oil‐cored bands provide field evidence for early migration of oil into a potential reservoir rock. We infer a hydrofracture mechanism, probably from petroleum leaking out of a stratigraphically lower overpressured reservoir. The deformation bands described here provide a potential field example of a mechanism inferred for petroleum migration in modern systems such as in the Gulf of Mexico. 相似文献
SHIH, M.J.H., LI, L.F. & REN, D., April 2017. Application of geometric morphometric analyses to confirm two new species of Karatavitidae (Hymenoptera:Karatavitoidea) from northeastern China. Alcheringa 41, 499–508. ISSN 0311-5518
Two new species, Praeratavites rasnitsyni and Karatavites ningchengensis in the wasp family Karatavitidae, are described and illustrated. These specimens were collected from the uppermost Middle Jurassic Jiulongshan Formation at Daohugou Village in Inner Mongolia, China. Key venation characters, as measured by relative positions or length ratios, are summarized for all documented species of Karatavites and Praeratavites to facilitate morphological comparisons and assess whether the studied specimens are referable to new species. In addition, geometric morphometric analyses were conducted to confirm the distinction of the new species, which add to the diversity of these genera in the Middle Jurassic.
Matthew J.H. Shih* [mpshih88@gmail.com] Union County Magnet High School, Scotch Plains, NJ 07076, USA; Longfeng Li [fenger4499@163.com] and Dong Ren [rendong@mail.cnu.edu.cn] College of Life Sciences, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing 100048, PR China. *Also affiliated with: Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA.相似文献
Eighteen genera of cosmopolitan marine algae are reported from Emsian and Eifelian limestones of New South Wales. Couvinianella, Paralitanaia, Perrierella, Pseudopalaeoporella and Renalcis are the most abundant taxa. Three distinctive floras are recognized: a prolific dasycladale-coccoid assemblage; a diverse udoteacean assemblage; and an undiversified udoteacean assemblage. None of these floras has a precise stratigraphic significance, although they indicate a latest Silurian-Middle Devonian age. Maslovina australense sp. nov. is described. 相似文献
An isolated ischium and possible neural arch recovered from the lower–middle Albian Griman Creek Formation near Surat, are the only sauropod postcranial elements from that unit in Queensland. This is the southernmost occurrence of sauropod post-cranial remains in eastern Australia. Comparison with other sauropod remains suggests that the ischium might represent an indeterminate titanosaur that is different from taxa previously named from Australia. 相似文献
The Dansirit Formation of the Shemshak Group is well exposed in the Parvar area, near the Rudbarak village, Central Alborz, Iran. It contains abundant well-preserved plant macrofossils belonging to 20 taxa of Equisetales, Marattiales, Filicales, Bennettitales, Cycadales, Corystospermales, Caytoniales, Czekanowskiales, Ginkgoales and Pinales. The new species Caytonia iranica sp. nov. is described. Based on the occurrence of Equisetites beanii, Coniopteris hymenophylloides, Nilssonia sarakhs, Czekanowskia blacki and Pseudoctenis fragilis, an early Middle Jurassic age is suggested for this assemblage. 相似文献