Jurassic Upper

Jet derives from trees related to the Araucaria family (which includes the monkey puzzle tree). It is found in the Jurassic, Upper lias strata, and is about 180 million years old. 

The Middle Jurassic consists mainly of marls. The Upper Jurassic formations are massive (over 100 m thick) and are made up exclusively of limestones. During Upper Jurassic and Lower Cretaceous the limestone deposits have been uplifted and resulted in a paleo-karst surface that hosts discontinuous bauxite deposits. Lower... 

Matthews A, Morgans-Bell HS, Emmanuel S, Jenkyns HC, Erel Y, Halicz L (2004) Controls on iron-isotope fractionation in organic-rich sediments (Kimmeridge Clay, Upper Jurassic, southern England). Geochem Cosmochim Acta, in press... 

The crude oil used by Bennett and Barter (1997) was a typical North Sea oil generated from Upper Jurassic, Kimmeridge clay formation source rocks. The alkylphenol distribution in a sample of (Miller) crude oil, determined using solid phase extraction (SPE), is shown in Fig. 16.21. The crude oil is dominated by phenol and cresol and contains appreciable quantities of dimethylphenols. The concentrations of 2,3-, 3,4-, and 3,5-dimethylphenol also include a contribution from 2-, 3-, and 4-ethylphenols, because they coelute under the conditions employed (Bennett et ah, 1996). 

Spalletti, L.A., Merodio, J.C., Matheos, S.D. 2008. Sedimentary petrology and geochemistry of siliciclastic rocks from the upper Jurassic Tordillo Formation (Neuque n Basin, western Argentina) Implications for provenance and tectonic setting. Journal of South American Earth Sciences, 25, 440-463. 

Cretaceous) kru = Lower Cretaceous j = Jurassic tr = Triassic z = Zechstein (Upper Permian) cwc = Westfalian C (Carboniferous) cw = Westfalian B cwa = Westfalian A (after Stadler, M. TeichmiiUer and R. TeichmiiUer (22))... 

Upper Jurassic, Morrison Formation, Blue Mesa, Uravan, Colo., U.S.A. (continental sandstone) Keller (1958) analyst B. Williams. 

Moore C.H. (1985) Upper Jurassic subsurface cements A case history. In Carbonate Cements (eds. N. Schneiderman and P.M. Harris), pp. 291-308. Society Economic Paleontologists and Mineralogists Special Publication 36, Tulsa, OK. 

Moore C.H. and Druckman Y. (1981) Burial diagenesis and porosity evolution, Upper Jurassic Smackover, Arkansas and Louisiana. Am. Assoc. Petrol. Geol. Bull. 65,597-628. 

Wagner P.D. and Matthews R.K. (1982) Porosity preservation in the upper Smackover (Jurassic) carbonate grainstone. Walker Creek field, Arkansas Response of Paleophreatic lenses to burial processes. J. Sediment. Petrol. 52, 3-18. 

Ross, C. A. M., Bath, A. H., Entwisle, D. C., Cave, M. R., Fry, M. B., Green, K. A., and Reeder, S. (1989). Hydrochemistry of Pore Waters from Jurassic Oxford Clay, Kellaways Beds, Upper Estuarine and Upper Lias Formations at the Elstow Site, Bedfordshire. WE/89/28, British Geological Survey. Keyworth, Nottingham. 

DeBari S. M., Anderson R. G., and Mortensen J. K. (1999) Correlation among lower to upper crustal components in an island arc the Jurassic Bonanza Arc, Vancouver Island, Canada. Can. J. Earth Sci. 36, 1371 — 1413. 

Wright V. P., Platt N. H., Mariott S. B., and Beck V. H. (1995) A classification of rhizogenic (root-formed) calcretes, with examples from the Upper Jurassic-Lxtwer Cretaceous of Spain and Upper Cretaceous of southern France. Sediment. Geol. 100, 143-158. 

Raiswell R., Newton R., and WignaU P. B. (2001) An indicator of water-column anoxia resolution of biofacies variations in the Kimmeridge Clay (Upper Jurassic UK). J. Sedim. Res. 71, 286-294. 

Lindgreen H. (1994) Ammonium fixation during illite-smectite diagenesis in upper Jurassic shale. North Sea. Clay Min. 29, 527-537. 

Kiessling, W., 1992, Palaeontological and facial features of the Upper Jurassic Hochstegen marble (Tauern window. Eastern Alps), Terra Nova 4 184-197. 

UJ = Upper Jurassic sands MJ = Middle Jurassic sands LJ = Lower Jurassic sands TR = Triassic sands NW = Norwegian well UK = British well... 

An interpreted regional seismic profile which includes parts of the Horda Platform (Fig. 3) show that the Triassic and lower-middle Jurassic sediments are offset up to 500 m along upper Jurassic block bounding and intra-block faults in a NW-SE profile. At the level of the Base Cretaceous Unconformity, however, only minor offsets are observed. Nearly all faults which cut the Base Cretaceous die out rapidly upsection. Only few faults can be observed on seismic lines in this area to extend upwards beyond the Cretaceous, which is similar to what has been described by for instance Glennie (1990). In this study... 

Quarte n a ry/Te n iary Paleooene Upper Cretaceous Lower Cretaceous Upper Jurassic I I Brent Gp./Dunlin Gp. 

In cases where detailed stratigraphies are unknown, or difficult to model, such as the Upper Jurassic and Lower Cretaceous, both of which contain potential reservoir sandstones, it is still possible to gain a good approximation of fault seal probability using... 

Pore pressure gradients are very difficult to estimate with the same accuracy in shales outside the reservoir zones, where RFT or DST measurements are impossible. We have, however, estimated pressure gradients in three wells on the border between the Melke and Gam Formations, based on the drilling data in Fig. 5. We have attempted to calculate the flow of water from the overpressured Upper Jurassic and Lower Cretaceous shales, into the underlying Middle Jurassic sandstones. The main uncertainty in... 

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