Fossil Ice Crystals An Instance of the Practical Value of Pure Science
Fossil Ice Crystals An Instance of the Practical Value of Pure Science
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Again in 1906 I noticed the same markings on some thin sandy flags which occur in the Del Rio clay near the city of Del Rio. In this case the needle-like crystals were somewhat more slender than those previously seen, and some were slightly curved and somewhat more elongated. These of course interested me as showing the occurrence of freezing temperatures no doubt at a somewhat earlier time than that pertaining to my previous observations.
During all these years my residence was in Illinois, an...d I was naturally watching for similar markings in recent mud, resulting from late and early frosts. I found them in the fall of 1909. At this time some excavations were being made in the loess in Rock Island, when some rains fell in the late fall. These rains evidently happened to give the mud the amount of moisture necessary for such crystals to develop, as the ground froze. The rains had washed the loess extensively, and I found a number of places where it lay redistributed, with a fairly smooth surface.
What to read after Fossil Ice Crystals An Instance of the Practical Value of Pure Science?
You can find similar books in the "Read Also" column, or choose other free books by Johan August Udden to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Again in 1906 I noticed the same markings on some thin sandy flags which occur in the Del Rio clay near the city of Del Rio. In this case the needle-like crystals were somewhat more slender than those previously seen, and some were slightly curved and somewhat more elongated. These of course interested me as showing the occurrence of freezing temperatures no doubt at a somewhat earlier time than that pertaining to my previous observations.
During all these years my residence was in Illinois, an...d I was naturally watching for similar markings in recent mud, resulting from late and early frosts. I found them in the fall of 1909. At this time some excavations were being made in the loess in Rock Island, when some rains fell in the late fall. These rains evidently happened to give the mud the amount of moisture necessary for such crystals to develop, as the ground froze. The rains had washed the loess extensively, and I found a number of places where it lay redistributed, with a fairly smooth surface.
What to read after Fossil Ice Crystals An Instance of the Practical Value of Pure Science?
You can find similar books in the "Read Also" column, or choose other free books by Johan August Udden to read onlineMoreLess
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