﻿Washington 
  — 
  Igneous 
  Hocks 
  from 
  Smyrna, 
  etc. 
  47 
  

  

  the 
  original 
  mineral 
  being 
  entirely 
  gone. 
  It 
  may 
  have 
  been 
  

   augite, 
  or 
  perhaps 
  more 
  probably 
  hypersthene. 
  A 
  few 
  larger 
  

   patches 
  are 
  reminiscent 
  of 
  magmatically 
  altered 
  hornblende. 
  

   The 
  groundmass 
  is 
  much 
  decomposed, 
  but 
  not 
  sufficiently 
  so 
  to 
  

   hide 
  the 
  fact 
  that 
  it 
  is 
  noncrystalline 
  and 
  largely 
  of 
  feldspar, 
  

   with 
  numerous 
  now 
  rusty 
  remains 
  of 
  long 
  ferromagnesian 
  

   microlites 
  and 
  laths. 
  Serpentinous 
  patches 
  are 
  also 
  present. 
  

   It 
  must 
  be 
  noted 
  that 
  the 
  rocks 
  of 
  Gioz 
  (Yous) 
  Tepe 
  are 
  

   referred 
  by 
  Rosenbusch 
  to 
  biotite-augite-andesites.** 
  

  

  Finally, 
  a 
  specimen 
  from 
  a 
  locality 
  " 
  3 
  km 
  south 
  of 
  Smyrna 
  in 
  

   the 
  railroad 
  cut 
  where 
  the 
  aqueduct 
  crosses 
  the 
  Meles 
  River," 
  

   may 
  be 
  briefly 
  mentioned. 
  This 
  resembles 
  the 
  gray 
  rocks 
  of 
  

   Mt. 
  Pagos, 
  but 
  is 
  rather 
  decomposed. 
  Under 
  the 
  microscope 
  

   the 
  phenocrysts 
  of 
  plagioclase 
  and 
  augite 
  are 
  rather 
  less 
  

   abundant, 
  and 
  only 
  few 
  of 
  biotite 
  are 
  to 
  be 
  seen. 
  The 
  ground- 
  

   mass 
  is 
  also 
  gray 
  and 
  thickly 
  sprinkled 
  with 
  dusty 
  grains 
  and 
  

   microlites, 
  and 
  there 
  is 
  little 
  or 
  no 
  evidence 
  of 
  flow. 
  Greenish 
  

   andesites 
  are 
  also 
  reported 
  by 
  Diller 
  from 
  this 
  neighborhood, 
  

   whose 
  color 
  is 
  apparently 
  due 
  to 
  decomposition. 
  

  

  Bioiite-dacite, 
  Pergamon. 
  — 
  The 
  hill 
  which 
  formed 
  the 
  

   acropolis 
  of 
  the 
  ancient 
  Greek 
  city 
  of 
  Pergamon 
  lies 
  25 
  km 
  east 
  

   of 
  the 
  coast 
  and 
  some 
  60 
  north 
  of 
  Smyrna. 
  It 
  stands 
  at 
  the 
  

   junction 
  of 
  two 
  small 
  streams 
  which 
  unite 
  here 
  to 
  form 
  the 
  

   ancient 
  Kaikos. 
  It 
  is 
  310 
  m 
  high 
  — 
  the 
  southern 
  end 
  of 
  a 
  long 
  

   ridge 
  which 
  rises 
  steeply 
  from 
  the 
  surrounding 
  alluvial 
  plain. 
  

   In 
  structure 
  the 
  hill 
  apparently 
  much 
  resembles 
  Mt. 
  Pagos, 
  but 
  

   I 
  do 
  not 
  feel 
  competent 
  to 
  discuss 
  this 
  point, 
  as 
  my 
  examina- 
  

   tion 
  was 
  too 
  cursory. 
  

  

  The 
  rock 
  of 
  which 
  it 
  is 
  composed 
  varies 
  rather 
  more 
  than 
  at 
  

   Mt. 
  Pagos, 
  being 
  generally 
  a 
  hornblende-free, 
  but 
  sometimes 
  a 
  

   hornblende-bearing, 
  biotite-dacite, 
  which 
  also 
  carries 
  orthoclase 
  

   in 
  considerable 
  amount. 
  As 
  the 
  presence 
  of 
  hornblende 
  does 
  

   not 
  affect 
  the 
  other 
  characters, 
  the 
  varieties 
  may 
  be 
  described 
  

   together. 
  A 
  few 
  tuff-like 
  masses 
  were 
  also 
  seen. 
  

  

  The 
  rocks 
  of 
  Pergamon 
  have 
  been 
  described 
  by 
  J. 
  Rothf 
  

   and 
  Lepsius.;}; 
  The 
  former 
  briefly 
  notes 
  that 
  sanidine, 
  abund- 
  

   ant 
  plagioclase 
  and 
  biotite, 
  and 
  rare 
  green 
  augite, 
  occur 
  in 
  a 
  

   compact 
  gray 
  groundmass. 
  No 
  augite 
  was 
  seen 
  by 
  either 
  

   Lepsius 
  or 
  myself 
  and 
  was 
  probably 
  hornblende 
  in 
  reality. 
  

   The 
  description 
  of 
  Lepsius 
  closely 
  agrees 
  with 
  mine, 
  though 
  

   he 
  notes 
  no 
  spherulites 
  and 
  speaks 
  of 
  the 
  hornblende 
  and 
  

   biotite 
  as 
  brown. 
  

  

  Over 
  the 
  greater 
  part 
  of 
  the 
  hill 
  the 
  rock 
  is 
  gray, 
  but 
  in 
  

   places, 
  as 
  in 
  some 
  of 
  the 
  long 
  slopes 
  and 
  near 
  the 
  Temple 
  of 
  

  

  * 
  Rosenbusch. 
  Mikr. 
  Phys., 
  ii, 
  889, 
  1896. 
  

  

  fRoth: 
  Geologie, 
  ii, 
  248. 
  

  

  ^Lepsius: 
  G-eologie 
  von 
  Attika, 
  Berlin, 
  1893, 
  168. 
  

  

  