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The work details the history of discovery, subsequent field visits by multiple researchers, and explains why the new authors conclude the organism is not closely related to Serpulites or Conularia. Includes an explanation of Plate XLII with figures covering associated fauna and shale-dolomite relationships.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":15,"@type":76,"position":81},"https://docshare.wps.com/document/literature/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/a-silurian-worm-and-associated-fauna-september-1931/427386/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/a-silurian-worm-and-associated-fauna-september-1931/427386.png","ImageObject",300,407,{"name":92,"@type":93},"McQueen","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-16","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What organism is the document primarily about?","Question",{"text":112,"@type":113},"It focuses on Lecthaylus gregarius, described as a worm-like organism from the mid-Silurian period.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How did the authors’ interpretation differ from the original description?",{"text":117,"@type":113},"They concluded that Lecthaylus gregarius is not closely related to Serpulites or Conularia, based on features observed in newly examined specimens.",{"name":119,"@type":110,"acceptedAnswer":120},"What does Plate XLII explain?",{"text":121,"@type":113},"It explains Plate XLII figures, including shale samples containing Lecthaylus gregarius and associated fauna, and the interstratification of shale and dolomite with identifications of 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INVERTEBRATE PALEONTOLOGY  \nAND  \nCAREY CRONEIS  \nASSISTANT PBOFESSOR OF PALEONTOLOGIC GEOLOGYUNIVERSITY OE CHICAGO  \nOLIVER CUMMINGS FARRINGTONCURATOB,DEPARTMENT OF GEOLOGYEDITOB  \nCHICAGO,U.S.A.SEPTEMBER,1931  \nGEOLOGICAL LIBRARYUNIVERSITY OF OKLAHOMAOdwin o.emithCollectionPeriodicalA10118391274  \n# FIELD MUSEUM OF NATURAL HISTORYFOUNDED BY MARSHALL FIELD,1893\n\nPUBLICATION 298  \nGEOLOGICAL SERIESVoL.IV,No.7  \n# A SILURIAN WORM AND ASSOCIATEDFAUNA\n\nBY  \nSHARAT KUMAR RoY  \nASSISTANT CURATOR OF INVERTEBRATE PALEONTOLOGY  \nAND  \nCAREY CRONEIS  \nASSISTANT PROFESSOR OF PALEONTOLOGIC GEOLOGYUNIVERSITY OF CHICAGO  \nOLIVER CUMMINGS FARRINGTONCURATOR,DEPARTMENT OF GEOLOGYEDITOE  \nCHICAGO,U.S.A.SEPTEMBER,1931  \nWHDRAWN  \n2  \n## PREFACE\n\nLecthaylus gregarius,an extraordinary mid-Silurian worm-likeorganism,was described by the late Professor Stuart Weller as being“manifestly related to Serpulites and Comularia.”The material uponwhich the original description was based was discovered by ProfessorPaul MacClintock(now of Princeton University)and a party ofstudents who were collecting graptolites from rock excavated duringthe construction of the Calumet feeder for the Chicago DrainageCanal,near Blue Island,Illinois.The type specimen and the topo-types in Walker Museum,University of Chicago,were collected in1924,chiefly by Messrs.T.A.Link,Edward De Losch and A.W.Slocom,and by Professors Paul MacClintock,D.J.Fisher and StuartWeller.  \nIn 1930,Mr.Bryan Patterson,of the Field Museum staff,wasguided to the type locality and assisted in collecting by Messrs.ScottGriffith,Edward Espenshade and Jack Appel,of the University ofChicago.The party made an excellent collection of a large number ofspecimens representing this species.Encouraged by the success of thefirst trip,Mr.Patterson,accompanied by Mr.Frank Letl,also ofthe Field Museum staff,and Mr.Paul C.Letl,paid a second visitand secured several species of dendroid graptolites other than thosepreviously known to occur there.  \nLater,Assistant Curator Sharat K.Roy of the Field Museumstaff,who had not seen these fossils prior to their arrival at FieldMuseum,became interested in their unusual character and beauti-fully preserved condition,and while examining them noted a numberof features not mentioned by the original author.It also appearedobvious to him thatLecthaylus gregarius was not related to Serpulites,much less to Conularia.Mr.Roy,therefore,accompanied by Mr.Patterson,visited the type locality,collected a number of completespecimens,and,unaware of any other interest in them,prepared apaper adding to Weller's original work such facts as might contributeto the existing knowledge of these fossils.When,however,the paperwas nearly completed,he learned that Assistant Professor CareyCroneis of the University of Chicago was also interested in the sub-ject and that he had been convinced for several years that the formin question was not closely related to Serpulites or to Conularia.  \nAccordingly,a joint paper presenting the results obtained byMessrs.Roy and Croneis is presented in the following pages.  \nOLIVER C.FARRINGTON  \n—  \nir  \nd   t bui   bna asi  g onliei sennnodat   b  8  daanodod4,       0 iao gnia  0ieolob fi  d o          ni nwoda royol                i fsbipebi al sisda idT     olob(ladaоо оо9 bli  \n# EXPLANATION OF PLATE XLII\n\n(For detailed description see pages 237-238)  \nFig.1.Sa=shale containing Lecthaylus gregarius and associated fauna.Sb=shale containing only Monograptus vomerinus.Photograph No.74582 Field Museum.  \nFig.2.Photograph showing interstratification of shale and dolomite.S=shale;D=dolomite.This shale is identical in composition and physicalproperties with Sa and Sb(Fig.1)but is not fossil bearing.Photograph No.74581Field Museum.  \nField Museum of Natural History  \n1","cbCailYzdD7goEbo","https://ap.wps.com/l/cbCailYzdD7goEbo","pdf",1976611,38,"English","# Preface\n# Explanation of Plate XLII","[{\"question\":\"What organism is the document primarily about?\",\"answer\":\"It focuses on Lecthaylus gregarius, described as a worm-like organism from the mid-Silurian period.\"},{\"question\":\"How did the authors’ interpretation differ from the original description?\",\"answer\":\"They concluded that Lecthaylus gregarius is not closely related to Serpulites or Conularia, based on features observed in newly examined specimens.\"},{\"question\":\"What does Plate XLII explain?\",\"answer\":\"It explains Plate XLII figures, including shale samples containing Lecthaylus gregarius and associated fauna, and the interstratification of shale and dolomite with identifications of components.\"}]","A Silurian Worm and Associated Fauna - September, 1931 | PDF",1790643701,59]