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Algae in Chuar series.  Nankoweap.

[[margin]] Lowest Exposed. [[/margin]] Simply crinkly bedding.  Up to several feet in thickness.

[[margin]] Vase form. [[/margin]] Occurs above white, strongly crosbedded coarse [[strikethrough]] ref [[/strikethrough]] sandstone.  Forms layer perhaps 10' thick over whose rounded masses the overlying shale is laid in sharp folds.  In the lower part of the formation the individual colonies are small rather irregular cylinders which sometimes bend rather sharply.  These cylinders show the regular Cryptozoan structure and widen a little as they grow.  Taken together they form large masses that are described below.  In the upper part of the bed the small cylinders give way to large rounded heads.  Both the cylinders and large heads combine to form huge vase-shaped masses.  Usually the base is narrower that a regular flare would require.
[[image - a sketch of a vase shape, wider at the top and narrow at the bottom.  The top is labelled 6'-8' and the height is labelled 10']]

Walcott makes a good drawing in his notebook.  Sample of the small tubes taken.