Smithsonian miscellaneous collections . GREYSONIA BASALTICA Walcott 146 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 DESCRIPTION OF PLATE 18 PAGE Greysonia basaltica Walcott. (See pi. 17) 109 Fig. I. (Natural size.) Vertical section of a group of tubes forminga layer 5 cm. in thickness. U. S. National Museum, Cata-logue No. tubes are filled with a bluish-black limestone and the algseare represented by gray to grayish-yellow magnesian limestone. The tubes were formed, in a horizontal position, presumably asportions of a large (Natural size.) Lower surface of a specimen of wh
Smithsonian miscellaneous collections . GREYSONIA BASALTICA Walcott 146 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 DESCRIPTION OF PLATE 18 PAGE Greysonia basaltica Walcott. (See pi. 17) 109 Fig. I. (Natural size.) Vertical section of a group of tubes forminga layer 5 cm. in thickness. U. S. National Museum, Cata-logue No. tubes are filled with a bluish-black limestone and the algseare represented by gray to grayish-yellow magnesian limestone. The tubes were formed, in a horizontal position, presumably asportions of a large (Natural size.) Lower surface of a specimen of which theupper surface is represented by fig. 2, pi. 17. U. S. NationalMuseum, Catalogue No. tubes of this specimen appear to have grown in a verticalposition, and have a length in the portions preserved of 18 cm. The specimens represented by figs, i and 2 are from locality 400c:Algonkian: Newland limestone; 8 miles ( km.) west of WhiteSulphur Springs, Meagher County, GR£YSONIA BASALTICA Walcott I 148 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 DESCRIPTION OF PLATE 19 PAGE Copperia tiibiformis Walcott no Fig. I. (Natural size.) Polished vertical section of a group of moreor less irregular tubes that form a layer cm. thick. National Museum, Catalogue No. 60716. 2. (Natural size.) Surface of a group of tubes that were formed in a horizontal position. U. S. National Museum, Cata-logue No. 60717. 3. (Natural size.) View of a natural section of a layer 5 cm. in thickness in which the three lower layers of tubes arefairly regular, while the upper layers show irregular S. National Museum, Catalogue No. form occurs in layers or tubes that are more or less parallelto the bedding of the layer. The specimens represented by figs. 1-3 are from locality 400c:Algonkian : Newland limestone; 8 miles ( km.) west of WhiteSulphur Springs, Meagher County, Montana. *N MISCELLANEOUS COLLECTION? VOL. 64, NO. 2. PL. 19
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