256  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Ordonez  (Ezequiel)— Continued. 
5.  Les  cendres  d'un  volcan  pres  du  Santa  Maria  (Guatemala). 
Soc.  Cient.  Ant.  Alz.,  Mem.  y  Rev.,  vol.  18,  pp.  33-36,  1902. 
Describes  materials  ejected  from  a  volcano  near  Santa  Maria. 
6.  The  mining  district  of  Pachuca,  Mexico. 
Am.  Inst,  Mg.  Engrs.,  Trans.,  vol.  32  pp.  224-241,  1902. 
Includes  an  account  of  the  topography  and  geology  of  the  area  and  the  ore  formations. 
7.  Le  Xinantacatl  ou  volcan  Nevado  de  Toluca  [Mexico]. 
Soc.  Cient.  Ant.  Alz.,  Mem.  y  Rev.,  vol.  18.  pp.  83-112,  5  pis.,  1902. 
Describes  physiographic  features,  the  character  and  occurrence  of  igneous  rocks,  and  the 
history  of  its  volcanic  activity,  and  compares  its  physical  features  with  those  of  other 
Mexican  volcanoes. 
8.  El  Sahcab  de  Yucatan. 
Soc.  Cient.  Ant.  Alz.,  Mem.  y  Rev.,  t.  18,  pp.  217-223,  1902. 
Describes  the  character  and  occurrence  of  some  geologic  formations  in  this  part  of  Mexico. 
9.  Los  volcanes  de  Zacapu,  Michoacan  [Mexico]. 
Soc.  Cient.  Ant.  Alz.,  t.  18,  pp.  257-265,  1  pi.,  1902. 
Describes  physiographic  features  of  the  volcanoes  of  this  region  and  the  character  and  occur- 
rence of  igneous  rocks. 
10.  Les  dernieres  eruptions  du  volcan  de  Colima  [Mexico], 
Soc.  Cient.  Ant.  Alz.,  Mem.  y  Rev.,  t.  20,  pp.  99-104,  2  pis.,  1903. 
Describes  eruption  phenomena  and  eruptive  products  of  this  volcano. 
11.  El  mineral  de  Angangueo,  Michoacan  [Mexico]. 
Mexico,  Inst.  Geol.,  Par.,  t.  1,  pp.  59-74,  1  pi.,  4  figs.,  1904. 
Discusses  vein  phenomena  and  the  occurrence  of  silver  veins  in  a  matrix  of  pyrite  and  galena. 
12.  Las  aguas  subterraneas  de  Amozoc  [Mexico]. 
Mexico,  Inst.  Geol.,  Par.,  t.  1,  pp.  117-120,  1904. 
Discusses  the  occurrence  of  underground  water  in  the  State  of  Puebla,  Mexico. 
13.  Las  cenizas  del  volcan  de  Santa  Maria. 
Mexico,  Inst.  Geol.,  Par.,  t.  1,  pp.  229-234,  1904. 
Describes  ashes  from  the  volcano  Santa  Maria,  Guatemala. 
14.  Description  de  las  rocas  [de  los  Estados  de  Chiapas  y  Tabasco]. 
Mexico,  Inst.  Geol.,  Bol.  no.  20,  pp.  101-113,  1905. 
Describes  the  petrographic  characters  of  igneous  and  volcanic  rocks  from  the  States  of  Chia- 
pas and  Tabasco,  Mexico. 
15.  Los  Xalapazcos  del  Estado  de  Puebla. 
Mexico,  Inst.  Geol.,  Parer.,  t.  1,  pp.  293-344,  4  pis.  and  1  map,  1905. 
Describes  the  physiographic  features  and  geologic  structure  of  the  district. 
16.  Las  Barrancas  de  las  Minas  y  de  Tatatila  [Mexico]. 
Soc.  Geol.  Mex.,  Bol.,  t.  1,  pp.  119-133,  1  pi.,  1905. 
Includes  notes  on  the  geology  of  the  region. 
17.  Los  crateres  de  Xico  [Mexico]. 
Soc.  Geol.  Mex.,  Bol.,  t.  1,  pp.  19-24,  1  fig.,  1905. 
Describes  physiographic  features  and  geologic  structure  of  the  Island  of  Xico  in  Lake  Chalco, 
Mexico. 
18.  El  Nauchampatepetl  6  Cofre  de  Perote  [Mexico]. 
Soc.  Geol.  Mex.,  Bol.,  t.  1,  pp.  151-168,  4  pis.,  1905. 
Describes  the  physiographic  features  and  geologic  structure. 
Ordonez  (Ezequiel)  and  B6se  (E. ). 
1.  Apuntes  para  la  geologia  del  valle  de  Chilpancingo  [Mexico]. 
Soc.  Cient.  Ant.  Alz.,  Mem.,  vol.  14,  pp.  5-12,  2  figs.,  1899. 
Contains  observations  on  the  geology  of  this  area. 
Ordonez  (E. ),  Lazo  (A.  M.)  and. 
1.  Las  canteras  de  San  Lorenzo  Totolinga  y  Echagaray  [Mexico]. 
See  Lazo  (A.  M.)  and  Ordonez  (E.),  1, 
