page_title: List of the Paleozoic life of Iowa
section_title: S
hierarchical_section_title: List of the Paleozoic life of Iowa / S
caption_attribution_description: English: Sphenothallus holdfast on a hiatus concretion from the Kope Formation (Upper Ordovician), Gunpowder Creek, Kentucky.
context_page_description: This list of the Paleozoic life of Iowa contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Iowa and are between 541 and 252.17 million years of age.
context_section_description: †Saccelatia
  †Saccelatia angularis
  †Saccelatia arcuamuralis
  †Saccelatia arrecta
  †Saccelatia bullata
  †Saccelatia cletifera
  †Sanguinolites
  †Scaphelasma
  †Schellwienella
  †Schellwienella crenulicostata
  †Schellwienella inaequalis
  †Schellwienella inflata
  †Schellwienella planumbona
  †Schizoblastus
  †Schizoblastus roemeri
  †Schizodus
  †Schizodus sedaliensis
  †Schizodus trigonalis
  †Schizophoria
  †Schizophoria amanaensis
  †Schizophoria athabaskensis – or unidentified related form
  †Schizophoria athabaskiensis – or unidentified related form
  †Schizophoria chouteauensis
  †Schizophoria dorsata
  †Schizophoria floydensis
  †Schizophoria floydia
  †Schizophoria impressa
  †Schizophoria iowensis
  †Schizophoria landoni
  †Schizophoria lata
  †Schizophoria laudoni
  †Schizophoria macfarlanei
  †Schizophoria macfarlanii
  †Schizophoria minor
  †Schizophoria multistriata
  †Schizophoria subelliptica
  †Schmidtella
  †Schmidtella affinis
  †Schmidtella brevis
  †Schmidtella lacunosa
  †Schmidtella latimarginata
  †Schuchertella
  †Schuchertella acutistriata
  †Schuchertella altirostris
  †Schuchertella humboldtensis
  †Schuchertella iowensis
  †Schuchertella nodocostata
  †Schuchertella parva
  †Schuchertella pectiniformis
  †Scofielda
  †Scofielda bilateralis
  †Scofieldia
  †Scofieldia bilateralis
  †Scutellum
  †Scutellum depressum
  †Scutellum thomasi
   †Scytalocrinus
  †Selenella
  †Selenella pediculus
  †Semitextularia
  †Semitextularia thomasi
  †Septemchiton
  †Septemchiton iowaensis
  †Septemchiton iowensis
  †Septopora
  †Serpulospira
  †Serpulospira paradoxus – type locality for species
  †Setigerites
  †Shumardella
  †Sieberella – tentative report
  †Sieberella insolita
  †Sievertsia
  †Sigournea – type locality for genus
  †Sigournea multidentata – type locality for species
  †Similodonta
  †Similodonta obliqua
  †Simulodonta
  †Simulodonta obliqua
  †Sinuites
  †Sinuites subcompressa
  †Siphonocrinus
  †Siphonocrinus nobilis
  †Skenidioides – tentative report
  †Skenidium
  †Skenidium independense
  †Smithiphyllum
  †Smithiphyllum belanskii
  †Sowerbyella
  †Spathella
  †Sphaerirhynchia
   †Sphenothallus
  †Spinatrypa
  †Spinatrypa aspera
  †Spinatrypa augusticostata – or unidentified comparable form
  †Spinatrypa bellula
  †Spinatrypa borealis
  †Spinatrypa hystrix
  †Spinatrypa mascula
  †Spinatrypa occidentalis
  †Spinatrypa planosulcata
  †Spinatrypa rockfordensis
  †Spinatrypa trulla
  †Spinatrypina
  †Spinatrypina angusticostata – or unidentified comparable form
  †Spinatrypina edmundsi
  †Spinocarinifera
  †Spinocarinifera arcuata
  †Spinocarinifera arcuatus
  †Spinocyrtia
  †Spinocyrtia alta
  †Spinocyrtia ballardi
  †Spinocyrtia capax
  †Spinocyrtia cedarensis
  †Spinocyrtia corvirostra
  †Spinocyrtia curvirostra
  †Spinocyrtia cyrtiformis
  †Spinocyrtia cyrtinaformis
  †Spinocyrtia iowensis
  †Spinocyrtia macbridei
  †Spinocyrtia pulchra
  †Spinocyrtia westerensis
  †Spinulicosta
  †Spinulicosta spinulicosta
   †Spirifer
  †Spirifer biplicoides
  †Spirifer forbesi
  †Spirifer gregeri
  †Spirifer legrandensis
  †Spirifer louisianensis
  †Spirifer marshallensis
  †Spirifer missouriensis
  †Spirifer orestes
  †Spirifer platynotus
  †Spirifer stratiformis
  †Spiriferina
  †Spiriferina solidirostris
  †Spiriferina solidirostrus
  †Spiriferina subtexta
  †Spirinella
  Spirorbis
  †Spyroceras
  †Stachyodes
  †Stachyodes costulata
  †Stainbrookia
  †Stainbrookia infera
  †Staufferella
  †Staufferella falcata
  †Stegocoelia
  †Stegocoelia quadricincta – type locality for species
  †Stenopareia
  †Stenopareia slocomi – or unidentified comparable form
  †Stenopareiea
  †Stephanocrinus
  †Stereostylus
  †Stereostylus aages – type locality for species
    †Stethacanthus
  †Stethacanthus depressus
  †Stethacanthus erectus
  †Stictopora
  †Stictostroma
  †Stictostroma ordinarium
  †Straparollus
  †Straparollus ammon
  †Straparollus argutus – type locality for species
  †Straparollus cyclostomus
  †Straparollus macromphalus
  †Streptelasma
  †Streptelasma trilobatum – or unidentified comparable form
  †Streptis
  †Streptognathodus
  †Streptognathodus delicatulus – type locality for species
  †Streptognathodus symmetricus – type locality for species
  †Streptorhynchus
  †Streptorhynchus tenuicostatum
  †Striatochonetes
  †Striatochonetes buchananensis
  †Striatochonetes schucherti
  †Striatopora
  †Striatopora iowensis
  †Stricklandia
  †Stricklandia l
caption: Fossilized holdfast of the Cambrian-Carboniferous conulariid Sphenothallus
exif: {"Image Make": "NIKON", "Image Model": "COOLPIX P90", "Image Orientation": "Horizontal (normal)", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS Macintosh", "Image DateTime": "2011:01:03 08:03:49", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "220", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "962", "Thumbnail JPEGInterchangeFormatLength": "12811", "EXIF ExposureTime": "1282051/50000000", "EXIF FNumber": "4", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "400", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2011:01:03 07:36:52", "EXIF DateTimeDigitized": "2011:01:03 07:36:52", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "3", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "169/10", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "613", "EXIF ExifImageLength": "613", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "836", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "0", "EXIF FocalLengthIn35mmFilm": "95", "EXIF SceneCaptureType": "Standard", "EXIF GainControl": "High gain up", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal", "EXIF SubjectDistanceRange": "0"}