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
An Act to amend the Criminal Code (offences relating to conveyances) stays in the body, possibly for days after use, which critics believe could lead to arrests of people who aren't impaired. Jody Wilson-Raybould argued that requiring police officers to have suspicion of impairment, before screening, would serve as "inherent protection to avoid charging drivers who were not actually impaired," and that the screening methods "are consistent with the approach taken in other jurisdictions." Critics have argued that the smell of marijuana in a vehicle could lead an officer to suspect impairment, regardless of whether it has been used by the driver, therefore leading to the requirement being ineffective. Serge Joyal