HARDIN SANDSTONE 643 



Page Plate 



Hardin sandstone 307, 591 29 



Harding sandstone 618 27 



Harpers schist 617 27 



Harrisburg axis 562, 656 



Barrier efficiency of 563 



Harrodsburg limestone 29 



Hebertella 502 



Heiskell shale 27 



Helderberg 28 



Helderbergian barrier 335 



deposits, Overlapping of 307 



fauna 517 



series, Position of 586 



Helicotoma 660, 664, 666, 671 



peccatonica Sard 669 



planulatoides 326 



sp 669 



? sp... 674 



(Euomphalus) uniangulata 631 



uniangulatum (Hall) 639 



Hercynella 491 



Hermitage formation 418 27 



Hesse sandstone 618 



Hexactinellida 501 



Hiatus at close of Tennessean (see also Contact and Unconformity) 476 



at base of Cambrian, Time value of 468 



Bighorn Mountains 308 



Catheys-Leipers 311 



Determination of extent of 5'81 



in stratigraphic record, Criteria for 374 



in Ouachita- Stringtown shales 677 



Little Falls-Lowville 457 



Ordovician-Silurian on flanks of Ozarkia 309 



Pamelia-Theresa 457 



Significance of 579 



Time significance of stratigraphic 378, 537 



Tribes Hill-Lowville 457 



Hiatuses included in apparent lithologic units 526 



Stratigraphic 457 



Time values of 459 



Highbridge limestone 27 



Hillsboro sandstone . . 28 



Hinckley formation 27 



Hiwassee shale. .'. 618 



Holmia 493 



Holopea 671 



raymondia 658 



sweet! Whitfield 630 



? turgida Hall 639 



