Changes

The Botucatu Formation is an aeolian sandstone deposit during the Jurassic in the Paraná basin, which displays large-scale sets of cross strata (1 - 30 m)([[:file:Botucatu_1.jpg|Figure 1.]]), formed in a desert environment similar to today’s Sahara Desert, during the Jurassic to Cretaceous on the Gondwanna Supercontinent, with an area of c.1,500,000 km².<ref name=Milani_2007>Milani, E.J.; Melo, J.H.G., Souza, P.A.; Fernandes, L.A.; França, A.B. Bacia, 2007, do Paraná. In: Cartas Estratigráficas - Boletim de Geociências da Petrobras, Rio de Janeiro, v.15, n.2, p.265-287</ref>

The Botucatu Formation is an aeolian sandstone deposit during the Jurassic in the Paraná basin, which displays large-scale sets of cross strata (1 - 30 m)([[:file:Botucatu_1.jpg|Figure 1.]]), formed in a desert environment similar to today’s Sahara Desert, during the Jurassic to Cretaceous on the Gondwanna Supercontinent, with an area of c.1,500,000 km².<ref name=Milani_2007>Milani, E.J.; Melo, J.H.G., Souza, P.A.; Fernandes, L.A.; França, A.B. Bacia, 2007, do Paraná. In: Cartas Estratigráficas - Boletim de Geociências da Petrobras, Rio de Janeiro, v.15, n.2, p.265-287</ref>

[[file:Botucatu_1.jpg|thumb|Figure 1. Large-scale of cross strata structure in the Botucatu Formation in Uruguay.]]

Botucatu_1.jpg|Figure 1. Large-scale of cross strata structure in the Botucatu Formation in Uruguay.

Its thickness can reach 400 m, the base is made of conglomerates and gravelly sandstones and coarse-grained sandstones, representing ephemeral streams and aeolian sand sheet deposits. It consists mainly of fine to medium-grained quartz sandstones, of red, pink or pale yellow color, well sorted, texturally mature, may contain altered feldspar cemented by silica or iron oxide, which gives it the reddish colour and also shows inverse grading.<ref name=Scherer_et_Golberg_2007>Scherer, C.M.S., Goldberg, K., 2007, Palaeowind patterns during the latest Jurassic–earliest Crateceous in Gondwana: Evidence from aeolian cross-strata of the Botucatu Formation, Brazil. Elsevier, Science Direct, Palaeogeography, Palaeoclimatology, Palaeoecology 250, 89-100.</ref>([[:file:Botucatu_2.jpg|Figure 2.]])

Its thickness can reach 400 m, the base is made of conglomerates and gravelly sandstones and coarse-grained sandstones, representing ephemeral streams and aeolian sand sheet deposits. It consists mainly of fine to medium-grained quartz sandstones, of red, pink or pale yellow color, well sorted, texturally mature, may contain altered feldspar cemented by silica or iron oxide, which gives it the reddish colour and also shows inverse grading.<ref name=Scherer_et_Golberg_2007>Scherer, C.M.S., Goldberg, K., 2007, Palaeowind patterns during the latest Jurassic–earliest Crateceous in Gondwana: Evidence from aeolian cross-strata of the Botucatu Formation, Brazil. Elsevier, Science Direct, Palaeogeography, Palaeoclimatology, Palaeoecology 250, 89-100.</ref>([[:file:Botucatu_2.jpg|Figure 2.]])

It´s morphologic reconstruction shows simple to compound aeolian dunes and complex linear draas. It´s preservation is due to the fragmentation of the Gondwana Supercontinent when lava flows from the Serra Geral Formation covered this erg.<ref name=Scherer_2000>Scherer, C.M.S., Faccini, U.F., Lavina, E.L., 2000, Arcaboucoestratigráfico do Mesozóico da Bacia do Paraná. In: Holz, M.,C.M.S. Scherer, K. Goldberg / Palaeogeography, Palaeoclimatology, Palaeoecology 250 (2007) 89–100 99De Ros, L.F. (Eds.), Geologia do Rio Grande do Sul. Editora daUniversidade/UFRGS, Porto Alegre, pp. 335–354.</ref>

It´s morphologic reconstruction shows simple to compound aeolian dunes and complex linear draas. It´s preservation is due to the fragmentation of the Gondwana Supercontinent when lava flows from the Serra Geral Formation covered this erg.<ref name=Scherer_2000>Scherer, C.M.S., Faccini, U.F., Lavina, E.L., 2000, Arcaboucoestratigráfico do Mesozóico da Bacia do Paraná. In: Holz, M.,C.M.S. Scherer, K. Goldberg / Palaeogeography, Palaeoclimatology, Palaeoecology 250 (2007) 89–100 99De Ros, L.F. (Eds.), Geologia do Rio Grande do Sul. Editora daUniversidade/UFRGS, Porto Alegre, pp. 335–354.</ref>