Annual report of the United States Geological Survey to the Secretary of the Interior . ARAUCARIOXYLON 08SCURUM FROM THE JURASSIC OF WYOMING. UNIVERSITY of ILLINOIS. PLATE CLXXIX. PLATE CLXXIX. Internal Structure of Fossil Wood from the Jurassic of theBlack Hills in South Dakota. Page. Fi rs. PlNOXYLOS DACOTENSE Kn. gen. ft sp. DOV 420 Fig. I. Transverse section, showing sharp in. of demarcation between fall and spring wood. ;_. 2. Transverse section of resin passage in fall wood, x Radial section, showing medullary rays with irregularly thickened walls and small bordered pits.
Annual report of the United States Geological Survey to the Secretary of the Interior . ARAUCARIOXYLON 08SCURUM FROM THE JURASSIC OF WYOMING. UNIVERSITY of ILLINOIS. PLATE CLXXIX. PLATE CLXXIX. Internal Structure of Fossil Wood from the Jurassic of theBlack Hills in South Dakota. Page. Fi rs. PlNOXYLOS DACOTENSE Kn. gen. ft sp. DOV 420 Fig. I. Transverse section, showing sharp in. of demarcation between fall and spring wood. ;_. 2. Transverse section of resin passage in fall wood, x Radial section, showing medullary rays with irregularly thickened walls and small bordered pits. 4. Radial section, showing bordered pits on walls of spring wood. >: 320. Fig. 5. Tangential section, showing a single medullary ray. x <i. Radial section, showing manner in which the medullary rays arethickened and also the ends of the cells, x 320. 74S. PINOXYLON DACOTEN5E, FROM THE JURASSIC OF SOUTH DAKOTA LIBHMtf THE STRAIIGRAPHIC SUCCESSION ()K THE FOSSIL FLORAS OF THE POTTSVILLE FOR-MATION IX TFIF SOUTHERN AN-THRACITE COAL FIELD PPNNSYLVANIA BY DAVIT) WHITE 749 CONTENTS. Page. Introduction 755 Application of the term Pottsville formation 755 Agency of fossil plants in the correlation of the terranes 756 Purpose and scope of this paper 757 General description of the Southern field 759 Form and extent of the field 759 General geologic structure 759 Description of the Pottsville formation in the type region 762 Composition of the formation 763 Conglomeratic nature of the Coal Measures 766 The Lykens or Pottsville coals 766 Nomenclature of the coals 768 The type paleobotanic section of the Pottsville formation 769 Fossil-plant collections 769 Species and their observed distribution within the formation and field 771 Paleontologic divisions of the formation 773 Floras of the Lower Lykens division 790 Flora of the Zero and No. 6 coals
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