Provenance (geology) Provenance (geology) Provenance in geology, is the reconstruction of the origin of sediments. The Earth is a dynamic planet, and all rocks are subject to transition between the three main rock types: sedimentary, metamorphic, and igneous rocks (the rock cycle). Rocks exposed to the surface are sooner or later broken down into sediments. Sediments are expected to be able to provide evidence of the erosion history of their parent source rocks. The purpose of provenance study is to restore the tectonic, paleo-geographic and paleo-climatic history. In the modern geological lexicon, "sediment provenance" specifically refers to the application of compositional analyses
Back to Now Back to Now Back to Now is the seventh and latest studio album by American R&B female group Labelle, released on October 21, 2008. The album is the group's first in over thirty years though they had sung on songs together on occasion. Labelle member Nona Hendryx explained the album's title to noted R&B writer Pete Lewis of "Blues & Soul": "It basically stemmed from two of the songs on this album being songs I'd specifically written for what would have been the next Labelle album back in 1977. So the title 'Back To Now" is really signifiying that this