Lower Ordovician Deepkill Formation, Argyle, NY
(revised) Faulted slaty mudstones just above (on the hanging wall of) the Taconic Frontal Thrust (Logan's Line; not exposed), at the leading edge of the Giddings Brook Slice of the Taconic Allochthon, State Route 40 (just south of the Old Scotch Cemetery), south of the Argyle Village on the east side of the highway. Landing (in Landing et al, 2007) identified this outcrop as "Deepkill Formation" (Lower Ordovician = Poultney Formation of others), while Platt (1960, PhD Diss.) mapped this as Lower Cambrian West Castleton Formation (=Browns Pond Fm and Middle Granville Slate of Landing and others). UC Davis geology student for scale.
Landing (in Landing and Webster, 2018) has a new (Oct. 2018) field trip location at this roadcut (his Stop 11) with an interesting description of the lithologies here (Lower Ordovician Deepkill Formation), but not the structural elements: castleton.s3.amazonaws.com/files/pages/a5-final.pdf
Lower Ordovician Deepkill Formation, Argyle, NY
(revised) Faulted slaty mudstones just above (on the hanging wall of) the Taconic Frontal Thrust (Logan's Line; not exposed), at the leading edge of the Giddings Brook Slice of the Taconic Allochthon, State Route 40 (just south of the Old Scotch Cemetery), south of the Argyle Village on the east side of the highway. Landing (in Landing et al, 2007) identified this outcrop as "Deepkill Formation" (Lower Ordovician = Poultney Formation of others), while Platt (1960, PhD Diss.) mapped this as Lower Cambrian West Castleton Formation (=Browns Pond Fm and Middle Granville Slate of Landing and others). UC Davis geology student for scale.
Landing (in Landing and Webster, 2018) has a new (Oct. 2018) field trip location at this roadcut (his Stop 11) with an interesting description of the lithologies here (Lower Ordovician Deepkill Formation), but not the structural elements: castleton.s3.amazonaws.com/files/pages/a5-final.pdf