00325_00593_Miller
ipc2008_fce1_00593_miller
Abstract title:
Abstract: In Northwest Saudi Arabia the Jauf Formation consists of five members, in ascending stratigraphic order these are: Sha’iba, Qasr, Subbat, Hammamiyat and Murayr. The age of the Jauf in this area ranges from Pragian? to Emsian.
Depositionally it consists of fluvial, estuarine and marine lithofacies. Within the clastics of this succession there are carbonate and shale beds that yield marine body and trace fossils. The acritarchs and spores were recovered from shallow stratigraphic core holes that provided unoxidized palynology samples for study.
The marine palynomorphs include veryhachids, Micrhystridium spp.,
Multiplicisphaeridium spp., various sphaeromorphic acritarchs, Winwaloeusia sp.
, Oppilatala spp.
and Polydryxium sp.
The assemblages are not particularly diverse and indicate near-shore and/or shallow water depositional conditions. A single chitinozoan species of the genus Angochitina also occurs in the
Hammamiyat Member and represents a distinct, correlative flooding event. In addition to the marine components noted above, fresh water representatives of the Chlorococcales, Family Hydrodictyaceae, including Bijugum , Musivum and
Tapetisphaerites , are present. All of these forms are thin-walled, planar coenobia and have a regular, geometric cell addition. This distinct morphology allows easy identification. They have been found in spore dominated palynomorph assemblages and indicate the presence of fresh water. They also occur as allochthonous components in the marine assemblages. Representatives of the Hydrodictyaceae are important indicators for recognition of estuarine and fresh water depositional environments in the Jauf succession. In combination with marine acritarchs, non-marine Paleozoic Hydrodictyaceae are proven to provide added paleoecological for identifying fresh water influence.
Pref. Session: 40. Miller/ Steemans/Wellman: Paleozoic palynology of the Arabian Plate and adjacent areas oral Pref.
Presentation:
Author(s)
University Name Country Organization Email
Miller,
Merrell
Breuer,
Pierre
Saudi
Arabia
Geological Technical Sercives
Devision, Saudi Aramco
Merrell.miller@aramco.com
Belgium NFSR Research Associate
Ghazi,
Abdulla
Marshall,
John
Saudi
Arabia
UK
Geological Technical Sercives
Devision, Saudi Aramco
School of Ocean and Earth
Science, University of
Southhampton
Steemans,
P
Belgium NFSR Research Associate

00325_00593_Miller