初步记述了采自辽西地区早白垩世义县组新的原始鸟脚类恐龙化石材料，并依此建立一新属新种上园热河龙（Jeholosaurus shangyuanensis gen. et sp. nov.）。化石产于北票市上园镇陆家屯义县组下部第一段灰白色凝灰质砂岩中，同一层位产出过大量鹦鹉嘴龙化石。上园热河龙的主要鉴定特征包括6个前上颌齿，鼻骨背面发育小孔，前齿骨约为前上颌骨主体长度的1.5倍、未发育股骨前髁间沟、骨不在一平面上，第三趾趾节中第四节最长。上园热河龙具有一些真鸟脚类恐龙的近裔性状，比如眶前孔小，方骨孔大，位于方颧骨侧面，外下颌孔缺失。另外，上园热河龙的股骨近端形态非常接近进步的鸟脚类恐龙。但是上园热河龙发育有6个前上颌齿，上下颌关节处与齿列位于同一水平线，前上颌齿列与上颌齿列位于同一水平线，这些原始特征未见于已知鸟脚类恐龙。上园热河龙确切系统分类位置需要进一步确定。 上园热河龙是义县组中发现的第二种鸟臀类恐龙，增加了这类恐龙在热河生物群中的分异度。
Most previously reported Mesoproterozoic (1600-1000 Ma) fossils are from silicified carbonates, and they are commonly small in size (15-20 μm, ranging from coccoids to fila- ments in morphology. Many of them can be interpreted as cyanobacteria. Carbonaceous shales represent another source of palaeontological information of the Mesoproterozoic biosphere. Sphaeromorphic and acanthomorphic acritarchs, as well as filamentous fossils, are common in many Mesoproterozoic shales. Here we report an unusual assemblage of tubular fossils from the Meosproterozoic Ruyang Group in Shanxi, North China. Some of these tubes are branched. Others bear annular-helical thickening that might be represented by one extinct algae to adapt to a desiccating environment.
Doushantuo phosphorites at Weng’an, Guizhou Province, provide a unique opportunity for the study of early evolution of multicellular organisms, including metazoans. Our light microscope and SEM observations, however, do not substantiate a sponge spicule interpretation of spicular structures. No convincing axial canals have been seen in the observed spicule population. Instead, the coexistence of some monaxonal spicules with clearly diagenetic crystal fascicles and dumbbells suggest that these monaxons may also be diagenetic in origin. Our preliminary EDS analyses detect no significant silicon in spicule-containing intraclasts (including abiotic clasts and fragments of sphaeromorphic acritarchs and algal thalli), that contain abundant monaxonal spicular structures. We, therefore, believe that the evidence for a sponge spicule interpretation of the Doushantuo spicular structures are at best ambiguous at present; these alleged sponge spicules are indistinguishable from coexistent diagenetic crystals.
Parelasmotherium linxiaense sp. nov.,discovered from the Hipparion fauna in Dongxiang County,Gansu Province,China,has large size,relatively weak enamel plications,and marked crista and hypocone to be distinguished from P.schansiense and P.simplum. The first discovery of the lower cheek teeth of Parelasmotherium is very important,because we can recognize more characters of Parelasmotherium different from those of Sinotherium based on them. This new species has an accurate horizon,and its age is the early Late Miocene.
