Sedimentary and petrographic analysis of the St. Peter sandstone
Sedimentary and petrographic analysis of the St. Peter sandstone
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圣彼得砂岩的沉积和岩相分析
DOI：
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发表时间：
1935
期刊：
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通讯作者：
G. A. Thiel
中科院分区：
文献类型：
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作者：
G. A. Thiel
圣彼得砂岩是密西西比河谷地区奥陶纪分布最广的砂质砂岩（图1）。该地层在伊利诺伊州、密苏里州、阿肯色州和俄克拉荷马州都有研究和描述，但在密西西比河谷上游还没有进行全面的沉积分析。进行这项研究的目的是为了确定更靠近其砂源的地层的特征，并将明尼苏达州和威斯康星州的圣彼得与更南部地区的地层进行比较（图1）。人们经常说，圣彼得砂岩是从波茨坦砂岩中衍生出来的，该砂岩在奥陶纪时期出现在密西西比河流域上游地区的前寒武纪地盾南缘周围。这些地层已经由分选良好和圆润的组分组成，提供了表征圣彼得砂岩的砂。这些沙子是通过。. .
INTRODUCTION The St. Peter sandstone is the most widespread arenaceous terrane of the Ordovician in the Mississippi Valley region (Fig. 1). The formation has been studied and described in Illinois, Missouri, Arkansas, and Oklahoma, but has not been given a comprehensive sedimentary analysis in the upper Mississippi Valley. This study was undertaken in an attempt to determine the characteristics of the formation nearer the source of its sands and to compare the St. Peter of Minnesota and Wisconsin with that of the regions farther south (Fig. 1). It has been stated frequently that the St. Peter sandstone was derived from the Potsdam sandstone that cropped out around the south margin of the pre-Cambrian shield in the upper Mississippi Valley region during Ordovician time. These formations, already composed of well-sorted and well-rounded components, supplied the sands that characterize the St. Peter sandstone. These sands were delivered to the Ordovician sea by . . .