8/2/2019 160 Million Year Old Plant Fossils From Honduras
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GCSSEPM Founda t ionO nl ine I SSNO n l i n e I S S N 2 1 6 1- 1 9
552161-1955
R e v i s e d J u r a s s i c a n d E a r ly C r e t a c e o u s
( P re -R e v i s e d J u r a s s i c a n d E a r ly C r e t a c e
o u s ( P r e -
Y o j o a G r o u p ) S tr a t ig r a p h y o f t h e C h o r t
sY o j o a G r o u p ) S tr a t ig r a p h y o f t h e C h o r t
s
B l o c k : P a l e o g e o g r a p h i c a n d T e c t o n i c
Im p l i c a ti o n sB l o c k : P a l e o g e o g r a p h i c a n
d T e c t o n i c Im p l i c a ti o n s
M A R K B . G O R D O NM A R K B . G O R D O N
Depar tment o f Geo logy and Geophys ics , R ice U nivers i ty ,
Housto n, Texas
77251-1892
Geologic mapp ing on the Chor t s b lock has def ined two m ajor
Mesozoic uni ts
which are o lder than the wel l-know n, lower Cretaceous Yo joa
Group. The two
units have been considered part of the same strat igraphic
element, the Honduras
Group. The Agua Fr a Format ion, a dominant ly c last ic m ixed
cont inenta l-mar ine
unit, has been dated as Middle Jurassic based on recent discover
ies of ammonites
and plant foss i ls. Dates as old as Rh aetian for similar rock
s have been reported in
the l i terature, but have not been conf irmed. No unfaulted
contact between theAgua Fr a Formation and the Yojoa Group has been
found. The Yojoa Group is
comm only under la in by a conglom erat ic uni t , the unnamed s
i l i c ic last ic member
of the Honduras Group, that is l i thological ly dist i nct f
rom the A gua Fra
Formation. Avai lable palynological data indicate that the
unnamed si l iciclast ic
member is restr icted to the lower Cretaceous. The H onduras
Group as currently
def ined is an inappropriate strat igraphic term. The two un its
of the group are not
contiguous and have signif icant dif ferences in l i thology,
and, especial ly , in age.
Inas-much as i ts usage is c aus ing st rat igraphic confus ion,
I r ecommend
abandoning the term Honduras Group. The Agua Fr a Formation is
left as an
independent strat igraphic element. The unnamed si l iciclast ic
member is herein
named the Tepemechn Formation after a r iver south of Lake
Yojoa.
Al though th icknesses as great as 1200m have been repor ted for
the Agua Fr a
Formation, i t is l imited to rather narrow bas ins probably of
str ike- sl ip or igin. Bycontr ast, the Tep em echn Formation is w
idespread yet thinner and was deposited
immediately pr ior to the deposit ion of the Yojoa Group l
imestones.
Sedimentological ly , the formation is similar to known r if t
deposits. Rif t ing
probably occurred in the ear l iest Cretaceous and was fol lowed
by subsidence
represented by the l imestone. Thus, the Chorts block exper
ienced str ike-sl ip
fault ing in the Middle Jurassic fol lowed by r if t ing
throughout the block in the
Ear ly Cretaceous wh ereas neighboring regions ex per ienced
pure r i ft ing from the
Midd le Jurass ic to the Cretaceous as ev idenced by th ick
depos i ts o f cont inenta l
redbeds.
--
++
P r e v i o us P r e v i o us | Ne x t P a p e rNe x t P a p e
r
T a b l e o f Co n t e n t sT a b l e o f Co n t e n t s
T h i s P a p e rT h i s P a p e r
Pub l i shed on l inePub l i shed on l ineDecember 12,
2011,December 12, 2011, doi :do i
:10.5724/gcs.92.13.014310.5724/gcs.92.13.0143
Published in: Mes ozo ic andMesozoic andEar ly CenozoicEar ly
CenozoicDevelopment of the Gulf Deve lopment of the Gulf of Mexico
and Car ibbeanof Mexico and Car ibbeanReg ion: A Context forReg
ion: A Context forHy d roca rbonHy d roca rbonExp lo ra t ion :Exp
lo ra t ion : 13 th Annua l13th Annua lEdited by John M.
Armentrout,Roger Bioch, Hilary C. Olson,and Bob F. Per kins. Vol.
13.1992. P.143-154
A b s t r a c tA b s t r a c t F r ee F r e e
References
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Th i s Vo lum e :Th i s Vo lum e :M e s o zo i c a nd E a r l yM
e s o zo i c a nd E a r l yCe no zo i c D e v e l o p m e n tCe no
zo i c D e v e l o p m e n to f t he G u l f o f M e x i c o a ndo
f t he G u l f o f M e x i c o a ndCa r i b b e a n R e g i o n :
ACa r i b b e a n R e g i o n : AC o n t e x t f o r H y d r o c a
r b o nC o n t e x t f o r H y d r o c a r b o nE x p lo r a t i o
n :E x p l o r a t i o n : 1 3 t h Annu a l1 3 t h A n n u a
lEdited by John M.Armentrout, Roger Bioch,Hilary C. Olson, and Bob
F.Perkins.Vol. 13. 1992.ISBN: 978-0-9836097-3-5.DOI:
10.5724/gcs.92.13.
Fea tu r ed Vo lum e :Fea tu r ed Vo lum e :
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w V i e w s o nS e i s m i c I m a g ing - - T he i rS e i s m i c
I m a g ing - - T he i rUs e i n E x p l o r a t i o n a ndUs e i n
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