Phylum: Mollusca (Mollusks)

Class:  Cephalopoda
Subclass: Ammonoidea 

Cretaceous Period (click for Pennsylvanian Period)


Family:
Collignoniceratidae
Prionocyclus

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

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

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


Family:
Placenticeratidae
Placenticeras sp.

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

Formation:  Eagle Ford
Period: Cretaceous
Loc: Texas.  Dallas Museum NH.
Ammonite split along internal chamber
  [+]
Formation: Eagle Ford 
Period: Cretaceous
Loc: Dallas, Tx. 2006
unknown ammonite

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


Family:
Acanthoceratidae  
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]
 


Subfamily:
  Desmoceratidae
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:
Acanthoceratidae  
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.
Tarrantoceras sp. 

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

Genus:
Submantelliceras
Submantelliceras 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:
Lyelliceratidae
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
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]
Engonocerassp. 
 [+]
Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx.  2005


Family:
  Brancoceratidae  Subfamily: Mortoniceratinae  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.
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. ammonite

Formation:  Weno?
Period: Cretaceous (98 mya)
Loc: Tarrant co., Tx.  Apr. 16, 2010.
Mortoniceras ammonite
 
Formation: Duck Creek 
Period: Cretaceous (100-101 mya)
Loc: Tarrant co., Tx.  no date
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
Drakeoceras was named by Young (1957).  It's type is Drakeoceras drakei.  It was synonymized subjectively with Angolaites by Kennedy et al. (1998). 


Family:
  Brancoceratidae  Subfamily: Mojsisovicziinae  Genus: Oxytropidoceras
Oxytropidoceras powelli ?

Formation:  Goodland
Period: Cretaceous (103-105 mya)
Loc: Tarrant co., Tx.  no date
??
 
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.  no date
Oxytropidoceras sp. cast

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


Genus:
Eopachydiscus
Eopachydiscus  

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.  no date
Eopachydiscus  

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

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