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478 GEOTECTONIC (STRUCTURAL) GEOLOGY. [Book IV. — 
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of many irregular layers inclined at a high angle in the direction in — 
which the formation of the mound had advanced. Among geological | 
- formations of all ages, occasional sections of the upper surfaces of 
such false-bedded strata show the singular irregularity of the 
structure, and bring vividly before the imagination the feeble shifting 
currents by which the sediment was drifted about in the shallow » 
water where it accumulated (Fig. 185). A noticeable feature is the 

Fic. 185.—PiLan or Upper Surrackr OF A FALSE-BEDDED COAL-MEASURE SANDSTONE, 
NouttTon HAvEN, PEMBROKESHIRE. (BY THE LATE PRoFEssOR JOHN PHILLIPS.) 
markedly lenticnlar character of false-bedded strata. Hyen where 
the usual diagonal lamination is feeble or absent this lenticular 
structure may remain distinct (Vig. 186). Examples may also be 
observed, in which, while all the beds are well laminated, in some 
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Fic. 186.—Fatse-Breppep Srrata, O1p Rep Sanpstonn, Ross, HEREFORDSHIRE. 
the lamine run parallel with the general bedding and in others 
obliquely (Fig. 187). Though current-bedding is most frequent 
among sandstones, or markedly arenaceous strata, it may be ob- 
served occasionally in detrital formations of organic origin, as in 
a section (fig. 188) by De la Beche, where a portion of one of the 
calcareous members of the Jurassic series of England, consists of beds 
composed mostly of organic fragments with a strongly marked 
