A Middle to Late Triassic (Ladinian–Carnian) radiolarian fauna was discovered in cherts of the Situlanglang Member of the Garba Formation, South Sumatra, which is generally regarded as of Late Jurassic–Early Cretaceous age. This fauna is characterized by the presence of Annulotriassocampe sulovensis, Triassocampe postdeweveri, Spongotortilispinus tortilis, Poulpus piabyx, Canoptum levis and others. This evidence possibly indicates that the deposition of the Situlanglang cherts took place after the collision of the Sibumasu and East Malaya blocks recorded in the Bentong–Raub Suture in Peninsular Malaysia in Late Permian–Early Triassic times. During the Middle–Late Triassic Sumatra and Peninsular Malaysia consisted of submarine horst and graben structures. It is possible that a submarine graben, the Tuhur basin, whose southern boundary was formerly undefined, extends into South Sumatra, to the area in which the Situlanglang cherts were deposited. The Situlanglang Member is proposed to be a rock unit stratigraphically contemporaneous with those of the Middle–Upper Triassic Kualu and Tuhur Formations in North and Central Sumatra.

中文翻译：

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印度尼西亚南苏门答腊省Garba山区中三叠世至晚期三叠纪放射虫的第一个证据

在南苏门答腊加尔巴组的司徒朗朗成员的石中发现了中三叠世（拉丁语-卡地语）的放射虫动物群，通常将其视为侏罗纪-白垩纪晚期。该动物区系的特征是出现了sulovensis环毛环鼻线虫，postdeweveri的Triassocampe线，Storgotortilispinus tortilis，Poulpus piabyx，Canoptum levis和别的。该证据可能表明，在二叠纪至三叠纪晚期，马来西亚半岛的Bentong-Raub缝合线中记录的西布马苏区块和东马来亚区块碰撞后，发生了斯图朗朗石的沉积。在中晚期三叠纪苏门答腊岛和马来西亚半岛由海底地物和grab抓结构组成。Tuhur盆地可能是一个潜艇，它的南部边界以前是不确定的，一直延伸到南苏门答腊，一直到Situlanglang deposited石沉积的地区。Situlanglang成员被认为是与苏门答腊北部和中部的中上三叠统Kualu和Tuhur地层在地层上同时存在的岩石单元。