The Springvale Formation at this outcrop it is expressed as a shell bed that has been described as either a wakestone – packstone (A. Sprague EXXON), a transgressive lag deposit or a glauconitic calcareous sandstone (Suter).
The outcrop is interpreted to represent a sequence boundary, with a transgressive lag deposit that consists of sandstone with abundant shell fragments. The shell material occurs in two ways either a complete shells or fine indeterminate fragments. The large shells are dominantly of two types, Oysters and Pecten, The oysters are all disarticulated and up to 15cm in size and 3cm thick. The Pecten however are commonly articulated and this suggests that they died in place while the oysters may have been reworked.
Oyster and Anadara shells