The Hawthorn Formation of previous investigators has been raised to group status in Georgia. The present investigation extends the formations recognized in southern Georgia into northern Florida with some modifications. The Hawthorn Group of southern Florida represents new lithostratigraphic nomenclature. / The Hawthorn Group in northern Florida consists of, in ascending order, the Penney Farms, the Marks Head and the Coosawhatchie formations. The Coosawhatchie Formation grades laterally and, in a limited area, vertically into the Statenville Formation. / Lithologically, the Hawthorn Group in northern Florida is made up of a basal carbonate with interbedded clastics (Penney Farms), a clastic-carbonate sequence (Marks Head), a predominantly clastic unit (Coosawhatchie) and a crossbedded, predominantly clastic unit (Statenville). Phosphate is present throughout these sediments. The ages range from early Miocene (Aquitanian) to Middle Miocene (Serravalian). / In southern Florida the group is comprised of two formations (in ascending order) the Arcadia and the Peace River. The Tampa Formation of former usuage is included as a lower member of the Arcadia Formation. Similarly, the Bone Valley Formation of former usuage is incorporated as a member in the Peace River Formation. / Lithologically the Arcadia Formation is composed of carbonate with varying amounts of clastics. Clastic sediments in the Arcadia are most prevalent in the Nocatee Member (basal Arcadia). The Peace River Formation is predominantly a clastic unit with some interbedded carbonates. Phosphorite gravel is most common in the Bone Valley Member. Sand sized phosphate is virtually ubiquitous in these sediments with the exception of the Tampa Member where it is often absent. The ages range from Early Miocene (Aquitanian) to Early Pliocene (Zanclian). / The Hawthorn Group in the eastern Florida panhandle is composed of the Torreya Formation and in a few areas a Middle (?) Miocene unnamed clastic unit. Lithologically, the Torreya consists of a carbonate rich basal section and a dominantly clastic upper unit. Phosphate is noticably less common in the panhandle Hawthorn Group sediments. / Source: Dissertation Abstracts International, Volume: 47-06, Section: B, page: 2350. / Thesis (Ph.D.)--The Florida State University, 1986.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75851 |
| Contributors | SCOTT, THOMAS MELVIN., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 478 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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