286  BIBLIOGRAPHY    OF     NORTH    AMERICAN    GEOLOGY 
Bies  (Heinrich)— Continued. 
6.  The  c  ayd  of  the  United  States  east  of  the  Mississippi  River. 
U.  S.  Geol.  Surv.,  Professional  Paper  no.  11,  298  pp.,  9  pis.,  11  figs.,  1903. 
Discusses  origin,  geographic  and  geologic  distribution  of  clays  in  the  United  States  east  of  the 
Mississippi  River,  and  their  properties,  composition,  and  utilization. 
7.  Uses  of  peat  and  its  occurrence  in  New  York. 
N.  Y.  State  Mus.,  55th  Ann.  Rept.,  pp.  r53-r90,  5  pis.,  1903. 
Describes  origin  and  nature  of  peat,  its  utilization,  and  its  occurrence  in  New  York. 
8.  Magnetite  deposits  at  Mineville,  New  York,  and  a  description  of  the  new  electric 
concentrating  plant. 
Mines  &  Minerals,  vol.  24,  pp.  49-51,  5  figs.,  1903. 
Describes  the  character  and  occurrence  of  the  iron  ore  deposits. 
9.  The  coal  mines  at  Las  Esperanzas,  Mexico. 
Mich.  Miner,  vol.  5,  no  2,  pp.  13-15,  5  figs.,  1903. 
Describes  the  character,  geologic  occurrence,  and  mining  of  the  Cretaceous  coal  beds. 
10.  Notes  on  mineral  developments  in  the  region  around  Ithaca  [New  York]. 
N.  Y.  State  Mus.,  56th  Ann.  Rept.,  pp.  rl07-rl08,  1904. 
Gives  notes  on  the  occurrence  of  economic  materials  and  a  geological  section  of  a  deep  well. 
11.  Notes  on  recent  mineral  developments  at  Mineville  [New  York]. 
N.  Y.  State  Mus.,  56th  Ann.  Rept.,  pp.  rl25-rl26,  1904. 
Brief  notes  on  the  occurrence  and  production  of  iron  ore  at  this  locality. 
12.  Clay  and  its  properties. 
N.  J.  Geol.  Surv.,  vol.  6,  pp.  1-115,  15  pis.,  34  figs.,  1904. 
iscusses  mode  of  occurrence,  methods  of  working,  chemical  and  physical  properties. 
13.  The  manufacture  of  clay  products,  with  special  reference  to  the  New  Jersey 
industry. 
N.  J.  Geol.  Surv.,  vol.  6,  pp.  211-533,  32  pis.,  5  figs.,  1904. 
Includes  notes  on  the  occurrence  and  properties  of  clays. 
14.  The  coal  fields  of  Texas.     Locations  of  the  different  deposits.     Quality  of  the 
coals  as  shown  by  analyses.     Production  of  the  State. 
Mines  &  Minerals,  vol.  26,  pp.  104-105,  2  figs.,  1905. 
15.  Economic  geology  of  the  United  States. 
New  York,  The  Macmillan  Company,  1905.     435  pp.,  25  pis.,  97  figs. 
Riggs  (Elmer  S. ). 
1.  The  Dinosaur  beds  of  the  Grand  River  valley  of  Colorado. 
Field  Col.  Mus.,  Geol.  ser.,  vol.  1,  pp.  267-274,  6  pis.,  1901. 
Describes  the  general  character  of  the  Cretaceous,  Jurassic,  and  Triassic  strata,  and  the  occur- 
rence of  vertebrate  remains. 
2.  The  fore  leg  and  pectoral  girdle  of  Morosaurus.     With  a  note  on  the  genus  Cama- 
rosaurus. 
Field  Col.  Mus.,  Geol.  ser.,  vol.  1,  pp.  275-281,  3  pis.,  1901. 
3    The  largest  known  dinosaur. 
Science,  new  ser.,  vol.  13,  pp.  549-550,  1901. 
Contains  brief  description  of  the  skeleton  obtained  by  a  recent  expedition  of  the  Field  Colum- 
bian Museum. 
4.  The  vertebral  column  of  Brontosaurus. 
Science,  new  ser.,  vol.  17,  pp.  393-394,  1903. 
5.  The  use  of  pneumatic  tools  in  the  preparation  of  fossils. 
Science,  new  ser.,  vol.  17,  pp.  747-749,  1903. 
6.  Brachiosaurus  altithorax,  the  largest  known  dinosaur. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  15,  pp.  299-306,  7  figs.,  1903. 
Gives  a  description  of  this  Jurassic  fossil  and  discusses  its  relationships. 
7.  Structure  and  relationships  of  Opisthoccelian  dinosaurs.     Part  1.     Apatosaurus 
Marsh. 
Field  Col.  Mus.,  Geol.  ser.,  vol.  2,  pp.  165-196,  8  pis.,  18  figs.,  1903. 
