EFFECT OF CLIMATE AND SOURCE AREA LOCATION ON BROWNS PARK FORM.ATION PETROLOGY The Browns Park Formation of Miocene age consists dominantly of cross-bedded feldspathic sandstones and was deposited by a series of northward flowing rivers

2. The palcogeography of the eastern Gulf Coast during Jacksonian (Late Eocene) limes was reconstructed by a combination taxonomic-morphologic method. For Tertiary faunules some of the precision lost by using taxonomic data alone, by the change from specific to generic level, is restored by adding morphologic data. This treatment of Jacksonian faunules is an elaboration of one introduced by L. W. Stach in 1936 and consists of determining relative frequencies of zoarial growth forms. Coupled with taxonomic data, these frequencies suggest water depths of 20-50 fathoms in Alabama and western Florida and 5-20 fathoms in peninsular Florida. The morphologic approach seems especially versatile and capable of extension, but for proper evaluation the adaptive significance of many features, e.g., avicularia and vibracula, must be ascertained.