Page 188 - Carbonate Platforms Facies, Sequences, and Evolution

7
4
2
3
5
0: Ota.
Table 1.
mudstone
limestones
binds tones
6 Nerineid
packstones
9 Fenestral
wackestones
B: Barriero.
Tubiphytes
Thrombolitic
and grainstones
M: Montejunto.
and wackestones
wackestones and
Intraclastic and
1 Ammonitic lime
8 Lime mudstones
Facies associations
Reefal limestones
bioclastic packstones
Limestone breccias
shales
oncolites
common
turbidites
intraclasts
packstones,
with reefal debris
a em and dm scale
limestones showing
Description
and omission surfaces
commonly
containing disseminated
Dense micritic limestones
and unbound wackestones
Dark clay-rich mudstones,
bioclasts and small micritic
Varied, highly fossiliferous
with a matrix of calcareous
scale slumps and carbonate
framestones, bindstones and
Dark, fine-grained bioclastic
Many clasts with thin oolitic
coats, oncolite-rich horizons
associated with shales, small­
associated with soil horizons
oncolitic, frequently showing
Mudstones, wackestones and
bafflestones, often associated
Oligomictic, matrix and clast
supported breccias, generally
with stromatactis-like cavities
wackestones, commonly with
thrombolitic or micritic crusts
considerable variation on both
0·5-l·Sm thick, framework of
'Lofer-like cycles', occasionally
Wide variety of types including
Zoophycos
Ptygmatis)
Tubiphytes
foraminifera
Rare or absent
dasycladaceans
bivalves, forams and
miliolid and cyclinind
In situ Megalodontids
sponges, Thartharella,
Principal biota
Ammonites, belemites,
encrusting foraminifera
Solenopora, chaetetids,
encrusting foraminifera
Restricted, low diversity:
Hexactinellid and lithistid
bivalves, encrusting algae,
Diverse: nerineids, corals,
nerineids, foraminifera and
(? Pachyrismella); nerineids
thick -walled dasycladaceans
Ptygmatis), dasycladaceans,
stromatoporoids, diceratids,
Diverse: Solenopora, corals,
Thin-shelled bivalves, corals.
bivalves, nerineids (including
nerineids bivalves, lithophagid
Diverse: corals, stromatoporids
conditions
carbonates
winnowing
Shelf interiors
marine sediments
marine sediments
biohermal mounds
supratidal sediments
but sheltered locations
Characteristics, interpretation and distribution of Upper Jurassic carbonate facies association of the Lusitanian Basin
Moderate-high energy, fully­
High-moderate energy, fully
Deep-water/low light intensity
variation caused principally by
Periplatform and basinal oozes
Shallow-subtidal, intertidal and
Subtidal lagoonal deposits with
Debris flows with resedimented
lagoonal sediments; lithological
Shallow marine, normal salinity
Environmental interpretation
Lower-energy deposition, largely
below wave-base and in shallower
some levels representing restricted