Siliciclastic sediment succession of the Bairenkonda Formation of the Proterozoic Cuddapah Supergroup overlies the granite-gneiss of the east Dharwar craton along a nonconformity in the Tirumala hills. Basin fill sediments are now classified in ascending order into three lithofacies assemblages namely; lower cross-stratified sandstone (CSS); middle sand-dominated heterolithic (MH) and upper shale-dominated heterolithic (UH) associations. Paleocurrent was towards east in CSS; bi-directional in MH and UH. Provenance was in west. Lithofacies attributes have indicated that the CSS was deposited along foreshore/supratidal environment where sedimentation had taken place under the combined influence of waves, storms and tides. The succeeding MH assemblage represents deposition in channels and distributaries over sandy intertidal flats. The upper mud dominated heterolithic assemblage (UH) was deposited in mixed intertidal to subtidal flats. Accordingly, the depositional milieu contemplated for the Bairenkonda Formation is tidal flat in shallow marine environment. Siliciclastic sediments thus deposited were uplifted due to basin inversion to form the mighty Tirumala hills in southwestern part of the Cuddapah basin, Andhra Pradesh.

中文翻译：

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安得拉邦库达帕盆​​地西南部 Tirumala 山 Bairenkonda 组潮滩沉积

元古界 Cuddapah 超群的 Bairenkonda 组的硅质碎屑沉积序列沿着 Tirumala 山丘的不整合面覆盖在东 Dharwar 克拉通的花岗岩-片麻岩上。盆地充填沉积物现在按升序分为三个岩相组合，即；下层交错砂岩（CSS）；中砂为主的杂岩 (MH) 和上页岩为主的杂岩 (UH) 组合。古海流在 CSS 中向东；MH 和 UH 双向。出处在西部。岩相属性表明 CSS 沿着前滨/潮上环境沉积，在这些环境中，在波浪、风暴和潮汐的共同影响下发生了沉积。随后的 MH 组合代表了在沙质潮间带上的河道和支流中的沉积。上层泥质为主的异岩组合（UH）沉积在潮间带至潮下带的混合滩地上。因此，Bairenkonda 组的沉积环境是浅海环境中的潮坪。这样沉积的硅质碎屑沉积物由于盆地反转而隆起，在安得拉邦库达帕盆​​地西南部形成强大的蒂鲁马拉山。