41 



p. 12. The lamina being inclined inward** in diiiriiptinjf by their own weight to LI some feet 

 i. I'i'iiiiE hi r I ■ - - h.f.-r . *h-iv ,[ l.ij., moo ml uf uarili j i . i - .-cm-. r ii li K u l t 1. 1 1 - 1 j 1 .1 1 . ■. L . 



I iwve now only to revert to the f»roovejs. The cinuriL::lancei al leiidiiuj I hem wlinh my 

 hypothcjia of thuir origin fuiul explain arc the^c; their gene rat prevalence; the eihuHKft, 

 however f ot ciposed 1 rtrekit devoid or them ; their being commonly confined in ihc sides 

 facing the cjtfcriyur of the M trul, although ^mecidiea. found on other and even on all iidei 

 gT a rotjfc; their great depth and regularity ; their gsncral coincidence with divisiaiajil lines; 

 their confonnitj' to ihccuiirfc- of ruin; and their -rcnE liruify. It i* I his last circumstance which ^ 

 prrseiitiufr at the outlet a great difficulty. Leads, on further consideration f la what I port- 

 filler the Imt i^pliiibi. [i-utj . That mulL-otii- iuftuunces liiive Ih:c:h iho great agent? of erosion 

 I h»TC already jugge^cd, But the .uitiijin 1 . permanent; character which is impressed on Lite 

 great iwajoriiy of the rock** their Ye^cliiliLe coatiufp , the hardness mid ^Juirpnos? of t tic 

 external edges of the groove, and the oWnce of id I ludica-lion* of the process of excava- 

 tion bein# at present in progress, prove iNat Iho rock!* must have existed under very diuY- 

 n ot conditions from ihe present f to c-naMu atitio^pheric forvea (□ produce results of such 

 rajj'mtude. The ^vniMdnr^tioutf which have liillierEo occupied us in Lliu- concluding porlioa 

 af this paper appear ta me to indicate what those conditions were* The composition and 

 structure of the external jtcIu, un veiled by the action of the «ea on the beach , jJicw 

 xones of soft rock (Jk rows of globular decomposing masses f and of harder forr urinous 

 ^iheroiiiii eie- sii*eeuEihk- of hemff dctacdicdj and a general tendency to pcrjictidicxv- 

 l-ur division, II ? therefore, we eouceivc llie external layer of the inland , when it Urst 

 hccunic exposed lu duuoinpOHlHm , ta have resembled in charuekT [he vow that has l>c*n 

 laid open for our inspection alortg Urn beach , it i* easy to comprehend how the wasliug 

 away of the more dueoni posablc part* might at last leave exposed masses, including bandit 

 of the tut* Jtlubboru imlerinl already purliatJe ^cued or diKentcgraied underground, and 

 thai the action of |Fia atmosphere mid rain (orrenU would gradually excavate (he more yield- 

 ing porlinn Utilil 1 1 1 u- :-uLl-1 rriuuank eiliditEfd lin ir ptesi-ul hluipi^. 



Tin? grooved and filriat^l xm-ks of Europe are by *omo gealogisU suppoded fo have- U'cn 

 caused by the action of I ho greaE and rapid) waves oil ted wavea of translation induced bv 

 I lie Fuddtu rleiJilum «f ftm ^n. ImmI nud laadecj with detritus, Now although in StAgoport 

 there is ample evidence of violent movenienU in Uio position in which we now hud the 

 *1 rati tied rock* {2} f we can hardly conceive llie Pulv Ubin tockj to lni¥u hrcn subjected to 



(I J Sam* r«kl ttliV T*e «lan^ thr hehth vil\t vhmtm* '1 »p 3 f##l feftttti U# l^n bfirg 4juiCfl bar^ irtJ 



tJit J,»eLE>>m 0 iaf| Jf-ceiBfiditili *jlii[incn. In tu«b fini'i n Eiiiii- of rack dtll'iTin^ in ccriipfl<i|Lop From Ui*l ailjoiu- 

 jr.g hj-B orjifiMilli' l»r#n gradual I y iL' diMi.|ii!H'J kiiJ yi ftihcJ hjuL 



ill Th* upjjfjiJ fuiikL lL nhi^h t!iii >itEip lafcini'ii t eftD te *bsGj¥*J ii in I he TJciatlj Stnjfnp&r* T*nn> •b^nL 

 tttrcii JnUfi I pi Ebe «9Utli of jPmIli L'&tn. Hut wHoU inlfrDidtilD' ceualrj it brchta wp in Ha mnqo m*q- 



fl*r p *u fe| lo prflfi-DL lh# ■|ipnrtC«t P En m*ny pkcri . ■ IfinpqiluoiiB ict 4 ami tbc biUovrV Lilfi jrd lirougiuUL 



id ci>Diii0tE«tl bnd «Mni1ir. I but I bare tin be no it-j-aUt ilmt I|lb fawtt* which M**nlt& ihqm tfef*lr4 du^Fng L da un 

 pifiicjd over & «rei ri jutLllilipg the IduLd^iel porliaQ pf thn I'tn.^Mnfa nn:\ An out Inn* irthiptiilg tiff. Toil 



dell. 1B47. F + 



