Niem, Alan R., Cressy, Frank B. (1973). K-Ar dates for sills from the Neahkahnie Mountain and Tillamook Head areas of the northwestern Oregon coas. Isochron/West Bulletin of Isotopic Geochronology, vol. 7, p. 13-16. Edited by: Schilling, John H. Keywords: Miocene Ecola State Park, Cape Meares, Indian Beach OR Clatsop OR