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Tomando-se como base o mapeamento realizado pelo Projeto RADAMBRASIL foi realizada a atualização destas informações de acordocom o Manual Técnico de Geologia, publicado pelo IBGE (http://biblioteca..ibge.gov.br/Manual). Primeira etapa desta atualização:pesquisa dos estudos/trabalhos mais recentes desenvolvidos na região, compatíveis com o nível de detalhamento do mapeamento(1:250.000), visando uma avaliação da incorporação destes trabalhos. Segunda etapa: através de imagens de satélites recentesfoi realizada uma reinterpretação temática. Terceira etapa: trabalho de campo visando solucionar dúvidas e coleta de materialquando necessário. Quarta etapa: reinterpretação final. Quinta etapa: armazenamento das informações gráficas e alfanuméricasatualizadas no banco de dados, estruturado para a utilização destas informações em um ambiente de SIG. Constam deste bancoinformações sobre as unidades geológicas, suas descrições, estruturas e análises diversas.

ver Fonte/+info (dt.atualização: 12/06/2018)

FID	GeologiaSC23.fid-6d9cbe3e_18e3b294723_-5faf
Folha	SC23
Legenda_Completa	269
Identificacao_Unidade	269
Nome_Unidade	Formação Piauí
Letra_Simbolo	C2pi
Litologia1
Litologia2
Litologia3
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Tempo_Geologico	Fanerozóico Paleozóica Carbonífero Pensilvaniano
Area_Poligono_Km2	18.686
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