VIII, A, 6 



Pratt and Smith: Petroleum Resources 



315 



Table III. — Stratigraphy of the Moera Enim oil field in southern Sumatra 

 according to Aug. Tobler. 



Series. 



Character. 



Thickness. 







Meters. 



Recent and younger Pleistocene 









ces, etc. 





Older Pleistocene 



Tuff and agglomerate, older terraces, etc. Effu- 

 sive rocks locally. 









Unconformity 









Upper Palembang formation. Tuff, sandstone. 



830 





and conglomerate. Fresh-water forms in the 







lower, well-bedded part, silicified wood. Sub- 





Pliocene (?) 



aerial and lacrustine origin. Effusive rocks lo- 

 cally. 









Middle Palembang formation. Marl and marly 



650 





sandstones. Bedded sandstones and unbedded 







clays with lignite beds. Estuary formation. 







Important oil horizon. 







Middle 



Lower Palembang formation. Shale and fine- 

 grained sandstone. Marine fossils. Volcanic 





Miocene ■ 





material, marl, and local coral reefs. Important 

 oil horizon. 



• 1,100+ 





Lower 



Shale with interbedded limestone and calcareous 







sandstone. Locally, clastic sediments, conglom- 







erate, tuff, agglomerate, sandstone, and marl. 







Marine formation. Doubtful oil horizon. 





Unconformity 









(Stage IV. Orbitoidal limestone 





Oligoeene 



1 Stage III. Bedded marl and fossiliferous lime- 

 1 stone. Petroleum bearing? 









iMarl with leaf impressions and fossil fish scales _ - 





Eocene 













Gneiss and schist with granite 







and diorite intrusions. 







General geologic sections. — An adequate description of the 

 individual stages is made difficult by the irregularity and varia- 

 bility of the upper strata. The limestones and calcareous sand- 

 stone of the Malumbang series are especially troublesome in this 

 respect and cannot be sharply defined. In reality all the strata 

 above the Vigo shale might be described as one formation — 

 massive sandy clay at the base, grading upward into sandstone 

 and limestone. Thus defined, the formation has a thickness of 

 about 250 meters. 



