. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. TERTIARY STRATA. 113 marls consist of various deposites, with sand abound- ing in fossil shells, of which about forty per cent, belong to existing species. The tertiary beds of Sicily consist of stratified marine deposites of clay, sand, and limestone, at great heights above the sea, and which contain 95 per cent, of existing species. The following section illustrates the tertiary for- mations in the valley of the Thames (Eng.). 1. Mar
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. TERTIARY STRATA. 113 marls consist of various deposites, with sand abound- ing in fossil shells, of which about forty per cent, belong to existing species. The tertiary beds of Sicily consist of stratified marine deposites of clay, sand, and limestone, at great heights above the sea, and which contain 95 per cent, of existing species. The following section illustrates the tertiary for- mations in the valley of the Thames (Eng.). 1. Marine sand. 2. London clay. 3. Plastic clay and sand. 4. Chalk. 5. Green sand. 6. River Thames. Bakewell observes, that from this small section the geological student may form some idea of the devastating effects of mighty inundations, which have swept over the surface of the globe, and car- ried away considerable portions of the upper beds. The marine sand, 1 1, which forms isolated caps on several of the hills in the Vale of the Thames, was Erobably part of one continuous bed, which has een excavated with a portion of the subjacent Lon- don clay; such excavations are common phenom- ena in almost every country. The following table will exhibit, at one view, the average thickness, in England, of the formations we have now described Fig. Feet. ( Pliocene 80 100 600 780. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lee, Charles A. (Charles Alfred), 1801-1872; Draper, Daniel, 1841-1931, donor. DSI. New-York : Harper & Brothers
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