[Reports volI-XIII] . These layers togetherwith the geode bed, which is usually considered the uppermember of the Keokuk, may be regarded as mere local devel-opments, to which little importance is to be attached. In aquarry a short distance northwest of Band park, at Keokuk,Iowa, there is a good exposure showing the upper surface of *Geology of Iowa, Vol. I, p. 971. 868. 70 GEOLOGICAL POBMATIONS the buff arenaceous limestone to be water-worn and weathered;and directly upon the eroded rock rests 20 feet of brecciatedlimestone. Whether or not this can be regarded as a portionof an ancient land s
[Reports volI-XIII] . These layers togetherwith the geode bed, which is usually considered the uppermember of the Keokuk, may be regarded as mere local devel-opments, to which little importance is to be attached. In aquarry a short distance northwest of Band park, at Keokuk,Iowa, there is a good exposure showing the upper surface of *Geology of Iowa, Vol. I, p. 971. 868. 70 GEOLOGICAL POBMATIONS the buff arenaceous limestone to be water-worn and weathered;and directly upon the eroded rock rests 20 feet of brecciatedlimestone. Whether or not this can be regarded as a portionof an ancient land surface, older than the Saint Louis lime-stone, depends partly upon the results of further investigation,and partly upon the final decision as to the origin of the brec-ciated roctc. Gordon, who has recently given- special atten-tion, is inclined to regard arenaceous member as the base ofthe Saint Louis. At Halls typical locality it is manifest that the Warsawbeds are properly the superior portion of the Keokuk lime-. rig. 3 Base of Saint Louie Limestone at Keoknk Stone. This inference is directly derivable from the faunal andstratigraphical features, and in a less marked degree from thelithological nature of the deposits. The layers passing underthis name reported from other localities are now known tohave various relationships with the overlying and underlyingstrata. Alleged faunal peculiarities have usually been thechief grounds for considering the Warsaw as a distinct sub-division of the Lower Carboniferous. Most writers on thesubject have united the beds under discussion with the SaintLouis; a few with the Keokuk. This difference of opinion THE WARSAW BEDS 71 has arisen largely from the assumptions made at the placemost thoroughly studied by the respective authors, withoutdue allowance being made for the varying conditions in distantlocalities. A careful comparison of notes and a somewhatextended study in the field show that the term Warsaw hasbeen very loosely applied sinc
Size: 2056px × 1215px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
