FCGS Newsletter - March 2015

Newsletter Summary

Christine Smith Siddoway presents new U Pb detrital zircon data showing that the Tava sandstone dikes of the Colorado Front Range derive from Neoproterozoic (770–680 Ma) Rodinia strata, with DZ peaks matching Grenville and Colorado sources. The work constrains emplacement to Pennsylvanian or earlier and links the dikes to early movement on the ancestral Ute Pass fault. In his Prez Sez column, President Paul Spear describes Mancos concretions and thanks John Youle. Regional news includes the upcoming San Juan College Energy Conference and a part time Petroleum Geology teaching opportunity.