Geological Survey Professional Paper 294—D Stromatolites of the Belt Series in Glacier National Park and Vicinity, Montana

Cover

Abstract

Introduction

Previous investigations
Present investigation
Area of investigation
Acknowledgments

Classification of stromatolites

General
Previous classifications
Present classification
   Generic distinction
   Specific characteristics
      Gross form of colony
      Nature of the laminae
      Size of colony
   Types
Key to the identification of stromatolites in the Belt series

Descriptions of genera and species

Genus Cryptozoon Hall
Genus Collenia Walcott
Genus Newlandia Walcott
Genus Conophyton Maslov

Stratigraphy

General
Stromatolite zones
   Ravalli group
      Altyn limestone
         Collenia frequens zone
      Grinnell argillite
         Collenia undosa zone 1
   Piegan group
      Siyeh limestone
         Collenia symmetrica zone 1
         Conophyton zone 1
         Collenia multiflabella zone
   Missoula group
      Collenia undosa zone 2
      Collenia symmetrica zone 2
      Conophyton zone 2

Ecology

Modern environments
Origin of stromatolites
Paleoecology
   Collenia frequens zone
   Newlandia lamellosa
   Collenia undosa zones
   Collenia symmetrica zones
   Conophyton zones
   Collenia multiflabella zone

Conclusions

Selected bibliography

Index (omitted from the online edition)

PLATE

18. Outcrop of Conophyton zone 1 in McDonald valley

19. Illustrations to accompany key to the identification of stromatolites

20. Collenia frequens Walcott and Cryptozoon occidentale Dawson

21. Cryptozoon occidentale Dawson, Collenia undosa Walcott, and Collenia multiflabella n. sp.

22. Collenia multiflabella n. sp., lithoid tufa, and Collenia symmetrica Fenton and Fenton

23. Conophyton inclinatum n. sp., dendritic tufa, and Newlandia lamellosa Walcott

24. Recent algal deposits and photomicrographs of Collenia and lithoid tufa

25. Stromatolite localities in Glacier National Park (omitted from the online edition)

FIGURE

49. Map of northwestern Montana and adjacent States, showing area of investigation and localities mentioned in text

50. Stromatolite zones in Glacier National Park

51. Algal deposits of type A (after Black, 1933)

52. Algal deposits of type B (after Black, 1933)

53. Algal deposits of type C (after Black, 1933)

54. Sequence of growth of algal deposits of type C (after Black, 1933)

55. Algal deposits of type D (after Black, 1933)

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Descriptions of eight zones of Precambrian stromatolites, including two new forms, based on a revised method of classification.

UNITED STATES DEPARTMENT OF THE INTERIOR
FRED A. SEATON, Secretary

GEOLOGICAL SURVEY
Thomas B. Nolan, Director

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