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Geology and Biology of North Atlantic Deep-Sea Cores If yon do not need this publication after it has served your purpose, please return it to the Geological Survey, using the official mailing label at the end UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGY AND BIOLOGY OF NORTH ATLANTIC DEEP-SEA CORES SUMMARY, FOREWORD, AND GENERAL INTRODUCTION PART 1. LITHOLOGY AND GEOLOGIC INTERPRETATIONS PART 2. FORAMINIFERA GEOLOGICAL SURVEY PROFESSIONAL PAPER 196-A UNITED STATES DEPARTMENT OF THE INTERIOR Harold L. Ickes, Secretary GEOLOGICAL SURVEY W. C. Mendenhall, Director Professional Paper 196-A GEOLOGY AND BIOLOGY OF NORTH ATLANTIC DEEP-SEA CORES BETWEEN NEWFOUNDLAND AND IRELAND SUMMARY OF THE REPORT FOREWORD, BY C. S. PIGGOT GENERAL INTRODUCTION, BY W. H. BRADLEY PART 1. LITHOLOGY AND GEOLOGIC INTERPRETATIONS By M. N. BRAMLETTE AND W. H. BRADLEY PART 2. FORAMINIFERA By JOSEPH A. CUSHMAN AND LLOYD G. HENBEST UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1940 For eale by the Superintendent of Documents, Washington, D. C. ------- Price 30 cents CONTENTS Page Page Summary of the report-_____________________________ VII Part 1. Lithology and geologic interpretation—Contd. Foreword, by C. S. Piggot___________________________ XI Evidence of bottom currents.____________________ 14 General introduction, by W. H. Bradley.______________ XIII Submarine slumping.___________________________ 15 Significance of the investigation._________________ XIII Carbonate content of the sediments_-_____. _______ 17 Location of the core stations.____________________ XIV Sulphates. _____________________________________ 21 Personnel and composition of the report___________ XIV Siliceous organisms_____-______-__----____-_--- 21 Methods of sampling and examination___________ XIV Role of mud-feeding organisms___________________ 22 Part 1. Lithology and geologic interpretations, by M. N. Mineralogy of the clastic sediments.______________ 23 Bramlette and W. H. Bradley. _____________________ 1 Spectroscopic tests._____________________________ 25 Examination and analysis of samples...___________ 1 Porosity of the sediments.-____.-__._-_________-. 26 Acknowledgments__ _ _ _________________________ 2 Mechanical analyses.______________-__-______..-- 28 Presentation of data.___________________________ 2 Basaltic pyroclastics and their alteration___________ 30 Stratigraphic units______________________________ 2 Volcanic rock in core ll______________-_-___-_--_ 32 Volcanic ash zones._________________________ 2 Basaltic mud in core 10________________________ 32 Glacial marine deposits__--__-_---___--_____- 3 Part 2. Foraminifera, by Joseph A. Cushman and Lloyd G. Correlation of zones represented in the cores.______ 5 Henbest.________________________________________ 35 Interpretation of the glacial marine succession______ 7 Preparation of samples_____________-_______-__-_ 35 Sources of detritus._________________________ 7 Acknowledgments. __ _ _________________________ 35 Temperature of the ocean, as indicated by the Distribution in the cores and list of species________ 35 deposits.________________________________ Pelagic Foraminifera-___________________________ 39 Interpretation of the glacial marine zones in Bottom-living Foraminifera___-_--__-.__-____-___ 46 terms of stages or substages of the Pleistocene- 10 Bathymetric distribution._______________________ 48 Post-glacial climatic changes.____„___________ 12 Temperature indications-________________________ 49 Rate of deep-sea sedimentation.__________________ 13 Age and correlation__________________________.__ 49 ILLUSTRATIONS Page PLATE 1. Bathymetric chart of a part of the North Atlantic Ocean showing the location of the core stations._______________ xv 2. Longitudinal sections of the air-dried cores---_--------__-----_-------_--------_-------------------------- xv 3. Diagram showing the lithology and correlation of lithologic zones in the cores___-__________-_____----_--_-_-_-.. 4 4. Diagram showing Cushman and Henbest's interpretation of water temperatures indicated by the pelagic Foram­ inifera- __-___-______„___-__________--_-__________-___-__-_______--__-_______--_---------.----------_ 4 5. A, Fecal pellets or filled borings in basaltic mud; B, Fecal pellets or filled borings in foraminiferal marl___________ 32 6. Standard pyramid diagram showing the size distribution, kinds of organisms, and mineral particles in four types of sediment_ __-____________________________-___-________-____-___-___-_--_---------___--_----------- 32 7. A, Zeolite crystals in clayey rock; B, Upper surface of the clayey rock, which is interpreted as an alteration product of basaltic lava; C, Palagonite rims surrounding fragments of unaltered basaltic glass; D, Foraminifera shells replaced by a zeolite.____________________________-____-_______--___---_-_-----_---_----------------- 32 8-10. Foraminifera from the North Atlantic deep-sea cores____________-__________-_____---_--,_---_--__--_--_---_ 51-54 FIGURE 1. Profile across the North Atlantic Ocean bottom along the line of the numbered core stations-________-_--____--_ xiv 2. Diagram showing the inferred relations of glacial marine and nonglacial sediments____________________________ 8 3. Diagram showing three interpretations of the glacial marine zones in terms of stages and substages of the Pleisto­ cene.---..---_--_---_-_-__-__------__-_---__--------_--_-----_---------------.--------------------- 10 4. Curve showing amplitude of solar radiation changes during the past 300,000 years___-__________--_---_------_ 12 5. Graph showing the CaO-CO2 ratios of core samples in relation to the CaO-CO2 ratio of pure calcite_ _____________ 17 6. Diagram showing distribution of volcanic ash shards in sediments._______-______-___-__________--_--_----_-- 22 7. Dehydration curves of basaltic mud from core 10, a red clay from the Pacific Ocean, and typical halloysite and montmorillonite from clay deposits in the United States_____________-____-_________--_--_-_-_-____------ 24 8. Relation of calculated original porosity of blue mud in core 3 to depth below top of core _______________-_-_----- 27 9. Sketch of the two halves of the top part of core 3 showing differential shrinkage.____--______-___-_-__-.-_---_ 28 10. Curves showing size distribution of organisms and mineral particles in blue mud, a gravelly foraminiferal marl, globigerina ooze, and clay________-___-_-_________-___--__-___-_-----_-_----_--------__-_------------ 29 11-21. Charts showing distribution and temperature significance of Foraminifera in the cores........________________ -- 36-45 in IV CONTEXTS TABLES Page TABLE 1. Geographic location, length of cores, and depth of the water from which they were taken___.----_-_----------- xiv 2. Grain-size distribution in sample B-53 from core 5 and approximate composition________________-_--_----_-_- 15 3. Distribution of magnesium carbonate within cores 3 to 13______-_______-_--_-__--__----_----_------------- 19 4. Lime-magnesia ratios of the samples shown in table 3_ _---._--__---------_----.----_--.-----_---------------- 21 5. Grain and lump density and porosity of dried mud from cores 3 and 10, ard calculated original porosity _,.___________ 27 6. Relative oxidation of iron in fresh and altered submarine basaltic glass-______________.________-_____-__--_--- 31 7. Analyses of mud from core 10 (sample W-15) and oceanic red cla3'S_____-__-__-_-____-___---_ _______________ 33 OUTLINE OF THE COMPLETE REPORT Foreword, by C. S. Piggot. General introduction, by W. H. Bradley. PART 1. Lithology and geologic interpretations, by M. N. Bramlette and W. H. Bradley. 2. Foraminifera, by Joseph A. Cushman and Lloyd G. Henbest. 3. Diatomaceae, by Kenreth E. Lohnaan. 4. Ostracoda, by Willis L. Tressler. 5. Mollusca, by Harald A. Render. 6. Echinodermata, by Austin H. Clark. 7. Miscellaneous fossils and significance of faunal distribution, by Lloyd G. Henbest. 8. Organic matter content, by Parker D. Trask, H. Whitman Patnode, Jesse LeRoy Stimson, and John R. Gay. 9. Selenium content and chemical analyses, by Glen Edgington and H. G. Byers. SUMMARY OF THE REPORT In May and June 1936 Dr. C. S. Piggot of the Geophysical zone has been identified. Other glacial marine deposits are Laboratory, Carnegie Institution of Washington, took a series of recognizable but their correlation is less certain. 11 deep-sea cores in the North Atlantic Ocean between the Three interpretations are offered as possible explanations of Newfoundland banks and the banks off the Irish coast. These the four glacial marine zones. The first is that each glacial cores were taken from the Western Union Telegraph Co.'s cable marine zone represents a distinct glacial stage of the Pleistocene ship Lord Kelvin with the explosive type of sounding device and that each zone of foraminiferal marl separating two glacial which Dr. Piggot designed. In the fall of that year he invited a marine zones represents an interglacial stage. This interpreta­ group of geologists of the United States Geological Survey to tion seems least probable of the three. The second interpretation study the cores and prepare a report. Biologists of the United is that the upper two glacial marine zones and the intervening States National Museum, the University of Buffalo, and chem­ sediment may correspond to the bipartite Wisconsin stage, ists of the United States Department of Agriculture cooperated whereas the lower two represent distinct glacial stages of the in the investigation and contributed to the report. Pleistocene separated from each other and from the zone repre­ The westernmost core of the series (No. 3)
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