Table 6. Lithology of formations in the vicinity of the Upper Paraguay river.1   Formation   Description   Moenda   Conglomerates or tillites, with sandstone, marl, and calcareous rocks.   Araras   Limestones, siltstones, marl.   Raizama   Quartz sandstones, quartz/feldspar sandstones.   Sepotuba   Siltstones, micaceous sandstones.   Puga   Conglomerates or tillites, with quartzites, granites, and schists.   Cerradinho   Sandstones, siltstones, limestones, dolomites, marl, metaconglomerates.   Bocaína   Calcareous dolomites, dolomites, calcareous sandstones.   Tamengo   Black limestone, with fine siltstones and sandstones.   Urucum   Arkosic sandstones, quartz/feldspar sandstones, metasandstones feldspar-rich metasandstones, conglomerates,    siltstones.   Santa Cruz   Jaspelitic arkosic sandstones.   Coimbra   Thin-bedded sandstones.   Alkaline   Fecho dos Morros Syenites, trachytes, porphyritic trachytes.   Xaraiés   Calcareous tufa, travertines, conglomerates with calcareous cement.   Pantanal   Sandy sediments, silty/clayey and sandy conglomerates, unconsolidated and semiconsolidated; fluvial and   lacustrine deposits in seasonally flooded areas. 1 Source:   Projeto RADAMBRASIL (1982a&b).