Fundamental study for the chronology of hominid fossils from Sambungmacan, Java

1977年9月，在日本-日本联合研究项目CTA-41下进行了一次地质调查（见Watanabe和Kadar [编辑]：特别酒吧，第4号，地质研究与发展中心（GRDC），万隆，1985年）在Sambungmacan附近的索洛河捷径运河遗址，1973年在那里发现了一个索洛人类型的头骨。在1977年的野外工作中，我们发现了一个保存完好的人类胫骨干碎片，它由4个沉积单元组成：Sb 1单元（与Kalibeng组相关）、Sb 2单元（cor. Kabuh组）、Uint-Sb 3（晚更新世阶地沉积）和Unit-Sb 4（近代冲积沉积）（马来西亚-日本联合研究小组：GRDC，1989年）。虽然胫骨标本（表面发现）的确切发现点尚不清楚，但标本的石化程度（宏观观察）和氟含量与该地点Kabuh等同物的下部至基部的骨骼相当。如果胫骨来自这些地层，那么它的年龄应该与早期爪哇人科（如爪哇猿人）相当，需要进一步的地层和年代学研究来澄清Sambungmacan人科标本的来源。

In September 1977 a geological survey was conducted under the Indonesia-Japan Joint Research Project CTA-41 (see Watanabe & Kadar [eds.]: Special Pub., No. 4, Geological Research & Development Center (GRDC), Bandung, 1985) at the Solo River short-cut canal site near Sambungmacan, where a skull of Solo man type was discovered in 1973. A well-fossilized shaft fragment of human tibia has been recognized among vertebrate bones collected during this 1977 fieldwork and stored in GRDC.The sediments exposed at the site consist of 4 units; Unit-Sbl(correlative with the Kalibeng Formation), Unit-Sb2(cor. with the Kabuh Formation), Uint- Sb3(late Pleistocene terrace deposits) and Unit-Sb4(recent alluvial deposits) in ascending order (Indonesia-Japan Joint Study Team: GRDC, 1989). While the exact findspot of the tibia specimen (surface find) is unknown, the degree of fossilization (macroscopic view) and the fluorine content of the specimen compare well with those of bones from the lower to the basal part of the Kabuh equivalent at the site. Provided that the tibia derives from these parts of strata, it should be comparable in age to early Javanese hominids such as pithecanthropines.Further stratigraphic and chronological investigations are required to clarify the provenances of the Sambungmacan hominid specimens.