119. Murder Creek Bed (Shale) Graycliff Erie Beach

The Murder Creek Bed is a distinct light-gray calcareous marker band within the Middle Devonian Wanakah Shale member (part of the Ludlowville Formation) in western New York.

Key Geological Details

• Stratigraphy: It serves as a recognizable stratigraphic marker band—along with other bands like the Bethany and Bidwells beds—within the soft, fossiliferous shales and mudstones of the Wanakah Shale. 

• Fossil Content: The Murder Creek bed and its associated strata are well-known among fossil collectors and geologists in Western New York for being exceptionally rich in marine invertebrate fossils, notably including the pink nacreous brachiopod [Pholidostrophia nacrea] and various Devonian trilobites (such as [Phacops]). 

• Location Context: While Murder Creek itself runs through Erie County (notably near Akron and Newstead, NY) exposing portions of Devonian strata, the "Murder Creek Bed" designation correlates across regional outcrops in western New York's shelf-to-basin ramp settings.

The Murder Creek, Bethany, and Bidwell beds are highly fossiliferous, calcareous marker horizons found within the Wanakah Shale Member of the Middle Devonian Ludlowville Formation in Western New York. These distinct limestone bands represent specific intervals within ancient sedimentary cycles and are renowned among paleontologists for their exceptional preservation of marine fossils. [1, 2, 3]

Key Strategic Beds

• Murder Creek Bed: A distinct, limey band located in the lower portion of the Wanakah Shale. It is highly enriched with trilobites (such as Eldredgeops rana and Greenops) and brachiopods. [1, 2, 3]

• Bethany Bed: A key calcareous marker bed used by geologists to track faunal shifts and water-depth fluctuations within the shale's fifth-order depositional cycles. [1]

• Bidwell Bed: Positioned slightly higher in the lower Wanakah section, this layer is frequently used as a baseline datum for correlating stratigraphic sequences across the region. It is also recognized historically as an "upper trilobite bed". [1, 2]

Geological Significance

• Depositional Environment: These layers formed roughly 380 million years ago when Western New York was covered by a warm, shallow tropical sea located south of the equator. [1]

• Carbonate Diagenesis: The harder, limey nature of these beds compared to the surrounding soft gray shale is due to carbonate accumulation below the seafloor during periods of slowed mud deposition.

• Fossil Bounty: Weathered exposures of these beds along regional stream cuts (such as Murder Creek in Genesee County) allow collectors to easily find intact molds of ancient bryozoans, corals, and crinoids. [1, 2, 3]