Scottish geographical magazine . llo valley, and 2000 feetbelow it runs the river Coello. In ancient times the great Coello glacier, whose thickness I haveestimated at 5000 feet, overflowed through this gap, and, joining theCombeima glacier, produced the fine medial moraine shown in thesketch. This glacier extended downwards from Ibagu6 some 25 miles, andprobably ended in the Magdalena valley lake. Its base is formed of ahard conirlomerate containinc; stones and boulders of all sizes, consider-ably worn. In the portion shown in the sketch it is 300 feet thick. The Combeima river runs in a ravi
Scottish geographical magazine . llo valley, and 2000 feetbelow it runs the river Coello. In ancient times the great Coello glacier, whose thickness I haveestimated at 5000 feet, overflowed through this gap, and, joining theCombeima glacier, produced the fine medial moraine shown in thesketch. This glacier extended downwards from Ibagu6 some 25 miles, andprobably ended in the Magdalena valley lake. Its base is formed of ahard conirlomerate containinc; stones and boulders of all sizes, consider-ably worn. In the portion shown in the sketch it is 300 feet thick. The Combeima river runs in a ravine of from 250 to 500 yards inwidth, with solid walls of this conglomerate on either hand. It is clearthat so small a stream as the Combeima could never by itself have cutout this canon. The work was probably done by the floods comingdown from the melting glaciers above, carrying stones, etc. The upper 15 or 20 feet of the deposit is formed of till, brick clay,beds of a marly felspathic earth, and loss. Most of the small streams. im^
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectgeography, bookyear18
