The deep boring at Spur . rial, effervescing slowlyin acid, but not slacking in water after ex-posed to reducing flame, nor becoming mag-netic. (2) Two pieces consist of dark gray,impure limestone, stratified. One is ob-scurely oolitic, the other is an oolitic fine-textured organic breccia, in which an apexof a gastropod, some bryozoans, and foram-inifera were noted. (3) A siliceous dolo-mite, dark gray, effervescing slowly, thinlylaminated, laminae about 89 in one inch. The Deep Boring at Spur 27 Feet From. Seen in vertical section, the laminae are ir-regular, turning in small abrupt bends so
The deep boring at Spur . rial, effervescing slowlyin acid, but not slacking in water after ex-posed to reducing flame, nor becoming mag-netic. (2) Two pieces consist of dark gray,impure limestone, stratified. One is ob-scurely oolitic, the other is an oolitic fine-textured organic breccia, in which an apexof a gastropod, some bryozoans, and foram-inifera were noted. (3) A siliceous dolo-mite, dark gray, effervescing slowly, thinlylaminated, laminae about 89 in one inch. The Deep Boring at Spur 27 Feet From. Seen in vertical section, the laminae are ir-regular, turning in small abrupt bends so asto frequently diverge, converge and end at ir-regular intervals. In places, they turnaround small imbedded granules. The lami-nae are marked by black, very thin folia,which are separated by thicker layers oftransparent material. The rock gives fumesof bitumens and sulphur when heated in aclosed tube. Plate 1, B. (4) A dark graydolomite of fine texture. In thin sectionit isi seen to consist of fine oolitic material, Figure 1. Impure oolitic and concretionary dolomite. From be-tween 1250 to 2042 feet below surface. Part of the rock is replaced byanhydrite. Matrix of the concretionary rock, showing crystalsof dolomite mm. in diameter. Minute concretions imbeddedin the matrix and having a fine texture. C. Trace of a fossil in theoriginal rock, shown by a smoothly curving zone of crystals of largersize than the prevailing crystals in the matrix. D. D. Crystals ofanhydrite replacing part of the matrix and parts of concretions^Magnified about SO diameters. 28 Bulletin of the University of Texas FeetFrom. To. the spherules being slightly less than 1 diameter, oval and spherical. With theseare mingled many organic fragments. Someotf these are thin fragments of ostracodshells, minute fragments of bryozoa andforaminifera, apices of gastropods, and tubu-lar structures. One of the foraminifera hasbiserially arranged chambers. In one sec-tion a perforate test was
Size: 1581px × 1581px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, bookidcu31924004622084
