PALEOZOIC FORMATIONS OF MARYLAND 



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upper part of massive bluish-gray limestones and calcareous 

 shales. The limestone is valuable for road-metal and in Garrett 

 county is quarried and burned to a considerable extent for quick- 

 lime which is used as a fertilizer. The thickness varies from 

 200 to 250 feet and the upper part is quite fossiliferous. The 



Fig. 3. — Greenbrier limestone on western bank of Voughiogheny River, south- 

 west of Oakland, Md. 



formation is named from Greenbrier county in southeastern 

 West Virginia where it reaches a thickness of lOOO feet or more. 

 Maiich CJiunk formation. — This, like the preceding formation, 

 crosses the county along the eastern face of Alleghany Front 

 but the band is broader, covering the upper part of the mountain 

 slope. The rocks are mainly red arenaceous and argillaceous 

 shales and sandstones, but a little above the middle of the forma- 

 tion is about 100 feet of reddish thin-bedded standstones. At 



