Lower Jurassic carbonate-platform deposits in Timor-Leste have been subject to much controversy. The Perdido Group contains the Bahamian-type facies shallow-water limestone of the Lower Jurassic that had been mixed with an upper Oligocene–lowest Miocene carbonate unit in Audley-Charles's Cablac Limestone. Foraminiferal assemblages from five sites in the Perdido Group are used to confirm a Sinemurian–Pliensbachian age. Species recorded for the first time from Timor and from the broader region, are Biokovina sp., Bosniella oenensis Gušić, Endotriadella ifranensis Bassoullet, Boutakiout, Vachard, Lituosepta recoarensis Cati, Palaeocyclammina complanata Bassoullet, Boutakiout and Echarfaoui, Planisepta compressa (Hottinger), and Radoicicina ciarapicae Gale, Barattolo and Rettori. Previously Siphovalvulina spp. and Meandrovoluta asiagoensis Fugagnoli and Rettori were described from the group. These species allow distinction between the Perdido Group (part of the Overthrust Terrane Association in Timor-Leste) and the carbonate-platform Upper Triassic Bandeira Group (part of the East Gondwana Interior Rift Association). No equivalent facies coeval with the Perdido Group and with similar foraminiferal assemblages have been recognized in the Indonesian, Malayasian, Timor-Leste, or north-west Australian regions. The closest known Sinemurian–Pliensbachian occurrence containing some of the species found in the Perdido Group, is in Western Thailand, with a fauna including Lituosepta cf. recoarensis.

东帝汶的下侏罗统碳酸盐台地沉积物备受争议。Perdido组包含下侏罗统的巴哈马型相浅水石灰岩，并与奥德利-查尔斯的Cablac石灰岩中的上渐新世-中新统最低的碳酸盐岩单元混合。Perdido组中五个地点的有孔虫组合用于确定Sinemurian-Pliensbachian年龄。第一次从帝汶和更广泛地区记录的物种是：Biokovina sp 。，Bosniella oenensisGušić，Endotriadella ifranensis Bassoullet，Boutakiout，Vachard ，Lituosepta recoarensis Cati，Palaeocyclammina complanata Bassoullet，Boutakiout和Echarfaoui，扁柏（Hottinger）和刺槐（Radoicicina ciarapicae Gale），Barattolo和Rettori 。以前是Siphovalvulina spp。和asiagovolensis该小组介绍了Fugagnoli和Rettori。这些物种允许区分Perdido小组（东帝汶Overthrust Terrane协会的一部分）和碳酸盐岩平台上三叠纪Bandeira小组（East Gondwana内部裂谷协会的一部分）。在印尼，马来亚，东帝汶或澳大利亚西北部地区，还没有与佩迪多集团和类似的有孔虫组合相媲美的相。已知最接近的Sinemurian–Pliensbachian事件发生在泰国西部，其中包括Lituosepta cf，其中包含在Perdido组中发现的一些物种。recoarensis。