搜索结果: 1-3 共查到“地质学 Middle Devonian”相关记录3条 . 查询时间(0.062 秒)
Karksilepis parva gen.et sp.nov.(Chondrichthyes)from the Burtnieki Regional Stage,Middle Devonian of Estonia
Chondrichthyes Burtnieki Regional Stage Middle Devonian Estonia
2009/10/21
Dermal scales of a new chondrichthyan were discovered in four levels in sandstones of the Härma Beds (lower part of the Burtnieki Regional Stage, Middle Devonian) in the Karksi outcrop of South E...
Roundness and surface features of quartz grains in Middle Devonian deposits of the East Baltic and their palaeogeographical implications
East Baltic Devonian roundness of detrital particles surface texture of quartz
2009/10/21
The roundness and surface texture of quartz grains were studied in Devonian sediments of 32 drill cores. Roundness was estimated in more than 800 samples and surface textures were examined under scann...
Abstract: The petrography of shale partings in carbonate rocks from eleven cores in the Illinois (Jeffersonville Formation) and Michigan Basins (Detroit River Formation) of Indiana indicates the prese...