BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 
VOL. 9, PP. 289-256, PL. 17 FEBRUARY 26, 1898 
SYENITE-PORPHYRY DIKES IN THE NORTHERN 
ADIRONDACKS 
BY H. P. CUSHING 
(Read before the Society December 29, 1897) 
CONTENTS 
Page 
MET OCU CH OTmem mamma creme Ne ot AN ba SoM Ne Mn Ae bene AES GRE es 239 
GCOOlOBle CRCUITINGCO Soe Pecos eee ee acne ted a ue enter yet ote aetcreae 240 
Geograpoloue Chisi@nl wine eas oe sion comedies Geass obo kaso boone es Gopoor 240 
GOGlOGiC AGO ds aboHss Foe Mb SC Ae REAR ME OISAL SE oy oiciete sec et prams Peay ware cae 
Literature....... PNP MRS ee ier iat tiatis Nabe. scarica oho asco ee. sep TMMeSIe steal a a acteurs Banus cistanting 243 
Materials composing the dikes........:..........--.-22..0-- herr at wies, Satay: 243 
Megascopic appearance ...... Ps ease eB caren cast RRA ROR ee IE Peo os onda on 243 
Mimeralicontentmandestructures. +: sis 4-14 tte caedec se ue cis taee ees 244 
Ondenxoty al umclamce ss a). kote auaris Gatos. eect es clotspaseel arabe a ists Gees @ onus 244 
IWitCKopeRtMIGe leer ci) ss oie, 2 cee er ese eG eee Te AIM 244 
SHO UIC waren ae bra Seah SOTA cial ul) t ur aera MURA Dag ta Ca hrephlfa 2, c aR a 245 
RlomanNe 3.685 58 Sooo RED rae cr criaa sn DOR eRE tA ne Bea sents 246 
PANIC Mapey ertete SF era sycbstit a a) are vob oli accu ars yar eenmaN CuAVe Mc tchal HM oe ieepecan seth 246 
(QOOAITIZA seid cacie letra a eee ee 1s SERUM esas Sees eee eel eye pe aaa .. 246 
TURO IM, ORCS sia tio eck has 6 Ue ISI GR Ree a O is. OiGeotch oka OoneLGIDIIRs aon ENE Aaa . 246 
AVAIL CRM Mrs each e ct Tate tats holars cls, co Weialaperastie GRRE ter erenssele a foci e waved ae, Se ecaynoee 246 
PAWN AAD IEE spsey i cstere pie cou cays ta poy cesar wh aco fle at Ws retecene oy ee chav altons etna shal ees a ae 246 
IMIECONAIW arnt Ge obs Se orien ees v2 eM eR espe ates Lae ee RUN 246 
CROUMNCMINMIES Gu Onitoasearcriamododco subussouoauh sor oooecacsad 247 
HReSMesshO etme pMateniall 7%, stiar-.~ 5 a severe di sdeuers oar Sgeisvetevernicia cotvere stare elma mele 247 
SHOOCTHG CUNANIN 8 Wencrd.e:oclc UO eRE ay a neeaeREs OCIS H IY aa iRine a teat eer ih ele oig Ger 247 
Chemical Conn rosilcrnly chose oma EAM inaHtonetiAod caeon oattandeu date 248 
Analyses ......... is cadre eer ie ee RDN MEER in hiv crc Sin SONA oS AAG O mio 248 
ID IGEN 5.o Gon oR os EAT pe eciRInPIn a ert bh doh erna Sores Gate aah 249 
RE UROL OCLC RHE) ytd OTIS LPOG ape vavese oy a/sis eos ovate ayo chee vou=| ya tevete meal spat states olelisneisies eoraeler ae 251 
(CGemenalecomClusSiomspn ner csv strane cee ciele se ctiees teacher mou lela saya ewan ueuemch see 254 
Fxg LAINVULO MMO Le PLACE By pspevcrsiels: ousacioiscte(are, «feet veins,» ln ote oe heV NRO AE TOA AOI ety Set 256 
INTRODUCTION 
While in the field in the northern Adirondacks during the past, few 
years the writer has noted dikes from time to time which prove to possess 
XXX VI—Butt. Geor. Soc. Am., Von. 9, 1897 (289) 
