During Triassic and Jurassic Periods 177 



Succeeding to the above is a paper (750:542) by E. 

 Wilson "On the Triassic Beds at Colwick Woods," in which 

 he refers to abundant fish-remains from the transition beds 

 of the Waterstones of the Upper Keuper which at this point 

 rest on the basement beds of the Lower Keuper. He speaks 

 of "quite a shoal of the fishes, these often lying over each 

 other," and then adds "these deposits I believe to have 

 probably had a fluviatlle origin. The waterstones on the 

 other hand, (at the base of which the fishes occurred, and 

 to which series they belong) are regularly bedded fine- 

 grained sandstones and marls, showing ripple marks and 

 sun-cracks." In a footnote he says: "in these lowest beds 

 of the Waterstones at Colwick I found the stem of a land 

 plant, having the appearance of Equisetites columnaris and 

 probably allied thereto." He considered that the strata 

 "were evidently formed in waters which were tranquil, but 

 extremely shallow, and liable to entire or perhaps partial 

 desiccation. These waters were in all probability those 

 of saline lakes or lagoons" (but why saline? writer). 

 "Possibly the fishes found at Colwick may have become en- 

 trapped in the shallows of such a lake, and killed in numbers 

 by the drying up or the increasing salinity of the water." 



L. J. Wills (757:28) confirms and in some respects 

 extends the above sets of results, while he gives a list of 

 organisms found by him in the sandstone and the shale 

 layers respectively thus : 



I. THE sandstone. II. THE SHALE. 



Plantae Plantae 



Equisetites arenaceus Equisetites arenaceus 



Zamites vogesiacus Zamites vogesiacus 



Voltzia sp. also Coniferous wood Voltzia 



Pj5Q£S Chiropteris digitata 



Acrodus, spine of Arthropoda 



Coprolite Estheria minuta 



Amphibia p^^^^^ 

 Labyrinthodont, tooth of 



„ Dtpteronotus cyphus 



Hyperodapedon 



Again a series of papers by L. Richardson (752:374, 

 385,425; 755:385) deal mainly with the uppermost or 

 Rhaetic rocks. In the latter publication he gives a very 

 detailed sectional table, which shows that the Sully beds 



