...Calico " or " Potomac " marble, found near the Point of Rocks, Maryland, is said by Prof. Merrill* to be the only true conglomerate or breccia marble that...been utilized to any extent in the United States. It consists of rounded and angular fragments of quartz and magnesian limestone of red, white, pale...

...pure white color that has been very extensively used for general building purposes in Baltimore and Washington and the neighboring towns, and to a less...sizes, up to several inches in diameter, of quartz and maguesian limestone imbedded in a fine gray calcareous groundmass. This composition renders the proper...

...Capitol extensions at Washington, DC Near Union Bridge, in Frederick County, there occurs я flue-grained and compact white magnesian limestone, but which has...extent in the United States is found near Point of Eocks. Frederick County, in this State. The rock, which belongs geologically to the Triassic formations,...

...and compact white magnesian limestone, but which has not been quarried to any extent. The only trne conglomerate or breccia marble that has ever been utilized to -any extent in the United Sutes is found near Point of Rocks. Frederick County, in this State. The rock, which belongs geologically...

...Calico " or " Potomac " marble, found near the Point of Rocks, Maryland, is said by Prof. Merrill* to be the only true conglomerate or breccia marble that...been utilized to any extent in the United States. It consists of rounded and angular fragments of quartz and magnesian limestone of red, white, pale...

...the greater portion of the century. The chief interest in this rock arises from the fact that it is " the only true conglomerate or breccia marble that...been utilized to any extent in the United States." ' This conglomerate is found in several places along the eastern slope of the Blue Ridge and is most...

...the greater portion of the century. The chief interest in this rock arises from the fact that it is " the only true conglomerate or breccia marble that...been utilized to any extent in the United States." * This conglomerate is found in several places along the eastern slope of the Blue Ridge and is most...

...Calico " or " Potomac " marble, found near the Point of Rocks, Maryland, is said by Prof. Merrill* to be the only true conglomerate or breccia marble that...been utilized to any extent in the United States. It consists of rounded and angular fragments of quartz and magnesian limestone of red, white, pale...

...the greater portion of the century. The chief interest in this rock arises from the fact that it is " the only true conglomerate or breccia marble that...been utilized to any extent in the United States." ' This conglomerate is found in several places along the eastern slope of the Blue Ridge and is most...

...the greater portion of the century. The chief interest in this rock arises from the fact that it is " the only true conglomerate or breccia marble that...been utilized to any extent in the United States." l This conglomerate is found in several places along the eastern slope of the Blue Ridge and is most...