NO. 1/ 



SMITIISONI.W i:.\l'I.()RATIONS, I916 



23 



was bodily (iuarried out of the hank, and tliese strata with their 

 contained corals were later set up in the exhihition hall of 

 paleontology. 



The lowest layer of limestone ( A ) is conii)osed largely of fossil 

 brachiopod shells. Next above is a layer with scattered corals (B) 

 belonging" to a long-tubed species (ColitJimaria calicina Nicholson), 

 probably torn by waves from a nearby coral reef. Overlying this 

 is a limestone stratum (C) largely made of the twiglike stems of 

 stony Bryozoa ( Tre])ostomata ) . 



Fig. 27. — Trenton limestcme outcrop near Lexington, Ky.. with one stratum 

 containing large heads of coral (.V). Photograph by Bassler. 



The main reef of corals (D) is chiefly composed of the rotinded 

 heads of three species of honey-comb corals, some with radial parti- 

 tions in the tubes {Colimiiiaria alvcolata Goldfuss), others withotit 

 such partitions (Colitmuaria Z'actia Foerste), and still others with 

 spongy walls (Calapoccia cribrifoniiis Nicholson). Large stems of 

 fluted or nodular Hydrozoa (Beatricca) are scattered among the 

 honey-comb coral masses. 



Horn corals (Strcf^telasiiia ntsticiiiii Pollings) are to be seen in 

 both the lower and upper coral beds. The spaces between the lime- 



