Phylum: Mollusca (Mollusks)

Class:  Cephalopoda
Subclass: Ammonoidea 
Order:  Ammonitida
(ammonites)

Cretaceous Period (click for Pennsylvanian Period)


Family: Collignoniceratidae
Genus: Prionocyclus

Prionocyclus sp.

Formation:  Eagle Ford (upper)
Period: Cretaceous
Loc: Grayson co., Tx.  Mar. 22, 2009.
Prionocyclus sp.

Formation:  Eagle Ford (upper)
Period: Cretaceous
Loc: Grayson co., Tx.  Mar. 22, 2009.
Prionocyclus sp.

Formation:  Eagle Ford (upper)
Period: Cretaceous
Loc: Grayson co., Tx.  Mar. 22, 2009.


Family: Placenticeratidae
Genus: Placenticeras

Placenticeras sp.

Formation:  Eagle Ford
Period: Cretaceous
Loc: Denton co., Tx.  2007.
Placenticeras sp.

Formation:  Eagle Ford
Period: Cretaceous
Loc: Texas.  Dallas Museum NH.
Placenticeras sp. (split)
  [+]
Formation: Eagle Ford 
Period: Cretaceous
Loc: Dallas, Tx. 2006
Placenticeras sp.

Formation:  Eagle Ford
Period: Cretaceous
Loc: Dallas co., Tx.
   


Family: Acanthoceratidae
Genus: Calycoceras

Calycoceras sp.

Formation:  Woodbine
Period: Cretaceous (95 mya)
Loc: Tarrant co., Tx.
Calycoceras sp.

Formation:  Woodbine
Period: Cretaceous (95 mya)
Loc: Tarrant co., Tx. [by Mercer B]
 


Family: Acanthoceratidae
Genus:  Metoicoceras

Metoicoceras ammonites

Formation:  Eagle Ford
Period: Cretaceous (94 mya)
Loc: Dallas co., Tx.  Feb. 24, 2007.
Metoicoceras ammonites

Formation:  Eagle Ford
Period: Cretaceous (94 mya)
Loc: Dallas Museum Natural History
??

Formation:  Eagle Ford
Period: Cretaceous
Loc: Denton co., Tx.  2007.


Family: Acanthoceratidae
Genus:  Tarrantoceras

Tarrantoceras sp. 

Formation:  Eagle Ford
Period: Cretaceous
Loc: Denton co., Tx.  Nov. 10, 2007.
   

Family: Acanthoceratidae
Genus: Mantelliceras

Mantelliceras brazoense

Formation:  Del Rio
Period: Cretaceous (98 mya)
Loc: McLennan co., Tx.  Nov. 17, 2007.
  unknown ammonite

Formation: Pawpaw
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  July 4, 2008.


Family:  Desmoceratidae
Genus: Desmoceras

Desmoceras sp.

Formation:  Eagle Ford
Period: Cretaceous
Loc: Dallas co.?, Tx. [by Shawn H]
Desmoceras sp.

Formation:  Eagle Ford
Period: Cretaceous
Loc: Dallas co.?, Tx. [by Shawn H]
 


Family: Lyelliceratidae
Genus: Stoliczkaia

Stoliczkaia scotti ??

Formation: Pawpaw
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Nov. 14, 2008.
Stoliczkaia scotti ?? [same]
[+]
Formation: Pawpaw
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Nov. 14, 2008.
Stoliczkaia scotti ?? [same]
[+]
Formation: Pawpaw
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Nov. 14, 2008.


Family: Engonoceratidae
Genus: Engonoceras

Engonoceras serpintinum

Formation:  Pawpaw
Period: Cretaceous (98 mya)
Loc: Denton co., Tx.  Sep. 8, 2007.
Engonoceras serpintinum

Formation: Pawpaw
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  March 16, 2008.
Engonoceras serpintinum

Formation:  Pawpaw
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Feb. 18, 2007.
Engonoceras stolleyi (?)

Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Denton co., Tx.  Aug. 18, 2008.
Engonoceras pierdenale (?)

Formation:  Glen Rose
Period: Cretaceous (108-113 mya)
Loc: Glen Rose, Tx.  Oct. 2006 [by Roz M]
Engonoceras sp. 
 [+]
Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx.  2005


Family:  Brancoceratidae
Genus: Mortoniceras

Mortoniceras equidistans
[+]
Formation: Duck Creek 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.
Mortoniceras sp. 
[+]
Formation:  Fort Worth 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  2010.
Mortoniceras sp. ? (right)

Formation: Duck Creek 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  Dec. 15, 2007.
Mortoniceras sp. ammonite

Formation:  Weno?
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Apr. 16, 2010.
Mortoniceras sp.

Formation:  Weno?
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Apr. 16, 2010.
Mortoniceras sp.
 
Formation: Duck Creek 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  2005
Mortoniceras (Angolaites) sp.

[formerly Drakeoceras]
Formation
:  Fort Worth?
Period: Cretaceous (100 mya)
Loc: Fort Worth, Tx.
Mortoniceras (Angolaites) sp.
[+]
[formerly Drakeoceras]
Formation
:  Fort Worth?
Period: Cretaceous (100 mya)
Loc: Tarrant co., Tx.  Sep. 9, 2007.
Mortoniceras (Angolaites) sp.

[formerly Drakeoceras]
Formation
:  Fort Worth
Period: Cretaceous
Loc: Tarrant co., Tx.  July 7, 2007.
Mortoniceras sp.
[+]
Formation:  Weno
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Aug. 15, 2009.
A cache of ammonites found 
close together.  

Formation: Duck Creek 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  no date

Formation:  Fort Worth?
Period: Cretaceous (100 mya)
Loc: Fort Worth, Tx.
Drakeoceras was named by Young (1957).  It's type is Drakeoceras drakei.  It was synonymized  with Angolaites by Kennedy et al. (1998). 


Family:  Brancoceratidae
Subfamily: Mojsisovicziinae
Genus: Oxytropidoceras

Oxytropidoceras sp.

Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx. 
Oxytropidoceras sp.  (view of ribs)
[+]
Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx. 
Manuiceras sp. or Oxytropidoceras powelli ?

Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx. 
Manuiceras sp. or Oxytropidoceras powelli ?
[+]
Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx.  2005
??
 
Formation:  Goodland?
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx.  no date
Oxytropidoceras (Adkinsites) diazi

Formation:  Kiamichi
Period: Cretaceous (102 mya)
Loc: Tarrant co., Tx. 
2005
Oxytropidoceras sp. cast

Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Denton co., Tx. 2007.
Oxytropidoceras sp. cast

Formation:  Kiamichi
Period: Cretaceous (102 mya)
Loc: Tarrant co., Tx.  April 14, 2013.
Oxytropidoceras sp. cast

Formation:  Kiamichi
Period: Cretaceous (102 mya)
Loc: Tarrant co., Tx.  April 22, 2012.


Family: Pachydiscidae
Genus: Eopachydiscus

Eopachydiscus marcianus  

Formation:  Duck Creek
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  no date
Eopachydiscus marcianus  

Formation:  Duck Creek
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  no date
Eopachydiscus marcianus  

Formation:  Duck Creek
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  no date
Eopachydiscus sp.

Formation:  Duck Creek
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  no date
Eopachydiscus  

Formation: Duck Creek 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  March 2007.