Spermatophyte plants that have unenclosed, "naked seeds": The fifth extant division is the flowering plants, also known as angiosperms or magnoliophytes, the largest and most diverse group of spermatophytes. Angiosperms possess seeds enclosed in a fruit, unlike gymnosperms. In addition to the taxa listed above, the fossil record contains evidence of many extinct taxa of seed plants. The so-called "seed ferns" (Pteridospermae) were one of the earliest successful groups of land plants, and forests dominated by seed ferns were prevalent in the late Paleozoic. "Glossopteris" was the most prominent tree genus in the ancient southern supercontinent of Gondwana during the Permian
Archaeological sub-disciplines these are not areas of study in their own right, and are only methods to be used in larger projects. Post-excavation analysis also makes use of a wide variety of further techniques. Archaeological sub-disciplines As with most academic disciplines, there are a number of archaeological sub-disciplines typically characterised by a focus on a specific method or type of material, geographical or chronological focus, or other thematic concern. Certain civilizations have attracted so much attention that their study has been specifically named. These sub-disciplines include "Assyriology" (Mesopotamia), "Classical archaeology" (Greece and Rome), "Etruscology" (Etruria), and "Egyptology" (Egypt). Another main division of