Pitkin Formation

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Pitkin Formation
Stratigraphic range: Upper Visean-Serpukhovian[1]
TypeFormation
Sub-unitsImo Shale
UnderliesHale Formation
OverliesFayetteville Formation
Thicknessup to and over 400 feet[2]
Lithology
PrimaryLimestone[1]
OtherShale
Location
RegionArkansas
CountryUnited States
Type section
Named forPitkin post office, Washington County, Arkansas[3]
Named byGeorge Irving Adams and Edward Oscar Ulrich

The Pitkin Formation, or Pitkin Limestone, is a fossiliferous geologic formation in northern Arkansas that dates to the Chesterian Series of the late Mississippian.[4] This formation was first named the "Archimedes Limestone" by David Dale Owen in 1858, but was replaced in 1904.[3] The Pitkin conformably overlies the Fayetteville Shale and unconformably underlies the Pennsylvanian-age Hale Formation. Some workers have considered the shales at the top of the Pitkin Formation to be a separate formation called the Imo Formation. More recently, others have considered the Imo to be informal member of the Pitkin Formation.

Paleofauna

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Early work aimed at creating a comprehensive list for all fossils found in the Pitkin Formation was done by Easton in 1943.[1] Unless otherwise stated, all species below can be found in his 'Fauna of the Pitkin Formation.'

Foraminifera

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A. stilus[5]
A. rugosus[5]
E. kleina[6]
E. phrissa[5]
E. explicata[5]
E. rugosa[5]
P. priscus[5]
T. corona[6]
Z. designata[5]
Z. discoidea[5]

Porifera, Sponges

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File:Cliona celeta.JPG
A modern Cliona from the coastal waters of northern France.

Scyphozoa

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  • Conularia Originally considered to be a gastropod.

Anthozoa, Corals

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A. gracilis
C. variablilis
L. major
L. minor
M. macerimuris[8]
P. eugenei
P. meekanum

Blastoidea

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File:Pentremites Glen Dean Fm KY.jpg
Pentremites godoni from the Lower Carboniferous of Illinois.
P. elongatus[9]
P. godoni[9]
P. laminatus[9]
P. obesus[9]
P. platybasis[1]

Crinoidea, Sea Lilies

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A. patulus [10]
A. planus[10]
B. figuratus[10]
C. stevensi[10]
C. eventus[10]
L. floweri[10]
O. pulaskiensis[10]
P. aptus[10]
P. durus[10]
P. pitkini[10]
P. stereostoma[10]
P. modulus[10]
P. cooksoni[10]
P. irregularis[10]
P. tridecibrachiatus[10]
S. braggsi[10]
S. dunlapi[10]
S. garfieldi[10]
T. whitfieldi[10]
T. caespes
T. residuus
Z. foveatus

Ophiuroidea, Brittle Stars

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This group was originally place under Stelleroidia in early studies.[1]

A. singulatus

Echinoidea, Sea Urchins

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File:Archaeocidaris brownwoodensis MHNT.jpg
An upper Carboniferous species of Archaeocidaris.

Worms

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Previous studies have grouped these diverse animals into a single, obsolete taxon: Vermes.[1]

Bryozoa, "Moss-animals"

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Stereo image
Left frame 
Right frame 
Parallel view (File:Stereogram guide parallel.png)
Cross-eye view (File:Stereogram guide cross-eyed.png)
Fossilized skeleton of Archimedes Bryozoan.
A. solida [1]
A. communis [1][11]
A. compactoides [11]
A. compactus [11]
A. distans [1][11]
A. fosteri [11]
A. fragilis [11]
A. intermedia (A. intermedius) [1][11]
A. invaginata (A. invaginatus) [1][11]
A. lunatus [11]
A. magnus [11]
A. meekanus [11]
A. moorei [11]
A. pitkinensis [11]
A. proutana (A. proutanus) [1][11]
A. sublaxus [11]
A. swallovana (A. swallovanus) [1][11]
A. terebriformis [11]
C. distans [11]
C. regularis [1]
D. levis [1][11]
F. cumingsi [11]
F. matheri [11]
F. rectangularis [11]
F. serratula [11]
F. tenax [11]
F. introspinosa [1][11]
G. crassa [1][11]
G. michilinia [1][11]
L. solida [1][11]
M. abrupta [1][11]
M. tenuis [1][11]
P. whitei [1]
S. biserialis [1]
S. cestriensis [1]
S. subquadrans [1]
T. cestriensis [1][11]
T. microfistulata [1][11]
T. poculoformis [1][11]
T refiexa [1][11]
T. subtilis [1][11]
File:Fenestella from Couvin Belgium.jpg
A Devonian Fenestella from Belgium.

Brachiopoda

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A. suspectum [12]
A. cestriensis
B. arkansana
C. cestriensis
C explanata
C. oklahomensis
C. sericeus
C. tumescens
Cliothyridina
  • C. sublamellosa
  • Composita (See unidentified section)
C. subquadrata
C. trinuclea
C. infimbriata
D. arkansanum
D. formosum
D. illinoisensis
D. shumardanum
D. whitfieldi
E. alternatus
E. costata
E. pitkinensis
E. vera
G. indianensis
H. multicostata
K. lucerna
L. newberryi var. moorefieldana and ovata
L. pileiformis
O. kaskaskiensis
O. stenopsis[12]
O. subglobosus (var. protensa)
O. uspectum
P. cestriensis
P. fasciculatus
R. setigera
S. leidyi
S. pellaensis
S. spinosa
S. aequalis
T. neogenes

Bivalvia, Bivalves

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This group was also referred to by another name in earlier studies: Pelecypoda.[1]

A. walkeri
A. batesvillensis
A. eurekensis
A. keoughensis
A. morrowensis
A. multilineatus
A. pitkinensis
C. peculiare
E. crassa (Along with E. crassa var. suborbiculoidea)
E. pitkinensis
L. vaseyana
M. compressa
M. longicardinalis
N. illinoisensis
S. arkansanus
S. chesterensis
S. depressus
S. insignis
S. cherokeense
S. gibsonense
S. quadriplicatum

Scaphopoda, Tusk Shells

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Gastropoda, Snails

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E. incarinatus
H. reticulatus
H. newtonensis
M. angulata
P. subrotundum
S. subcorpulenta
S. planidorsatus
S. triliris

Cephalopoda

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A. furnishi[13]
C. hesperium
C. richardsonianum[13]
C. randolphensis
C. equoyahensis
D. eurekensis
E. globosus
E. bisulcatum[13]

Trilobita

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G. pustulosus
K. chesterensis
K. pitkinensis[14]
P. mucronatus

Ostracoda

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G. optina
P. fayettevillensis

Vertebrata

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Plantae, Plants

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"Encrusting Algae" has been reported but not assigned to any genus.[1]

A. cordillerensis[5]

Unidentified

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Following is a list of fossils also found in the Pitkin by Easton in 1943 that have gone unidentified.[1]

  • A "Cup Coral"
  • A member of the genus Pentremites
  • Three species within Agassizocrinus
  • Two species within Scytalocrinus
  • A totally unidentifiable Crinoid
  • Two species of Bellerophon
  • Two species of Gosseletina
  • Two species of Leptoptygma
  • Two Species of Strobeus
  • One species each of Composita and Echinoconchus
  • Two species of Cypricardella
  • Two species of Coloceras, one of which may actually be Leuroceras
  • One species of Dolorthoceras
  • An unnamed shark spine

See also

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References

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  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am Easton, William H., The Fauna of the Pitkin Formation of Arkansas., Journal of Paleontology: vol. 17:2. March, 1943.
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  7. ^ a b c d Webb, Gregory., 1987., The Coral Fauna of the Pitkin Formation (Chesterian), Northeastern Oklahoma and Northwestern Arkansas. Journal of Paleontology vol. 61:3
  8. ^ a b Webb., Gregory., 1990., A New Tabulate Coral Species from the Pitkin Formation (Chesterian) of north-central Arkansas. Journal of Paleontology vol. 64:4.
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