...Ervin G. Otvos Abstract Some new thoughts are offered to explain the development of rhomboid-deltoid-shaped surface marks, occurring on marine beaches, usually called "rhomboid ripple marks." Observations on their development and 3260 measurements of their acute angles were employed. The marks...

...David Franklin Demarest Abstract Measurements of the acute angles of rhomboid ripple marks and their relationship to beach slope are tabulated and discussed. The motions of the backwash and the subsequent run-off are described with special reference to the mode of origin of rhomboid ripple marks...

...John H. Hoyt; Vernon J. Henry Abstract The direction of current flow over the beach surface may be determined from the shape of rhomboid ripple marks. Characteristically these ripples are bowed in the direction of current flow and are pointed up-current. They are formed on the foreshore beach...

... by this transition but also by downfan energy dissipation within subcritical portions of the flow. From berm crest to fan terminus (i.e., downstream) the lateral sequence of bed geometries is: flat, erosional bed; antidunes; flat bed with primary current lineation and rhomboid rill marks; flat, featureless bed...

.... Certain original structures in the Lyons such as cross-stratification, lamination, and rhomboid ripple mark are compared with similar features of modern beaches. These facts and inferences combined with the stratigraphic relationships of the Lyons lead to the conclusion that the Lyons sandstone...

... platform edge). Yellow arrows, in zoomed view, point at spotty features, possibly dissolution pipes. Note the rhomboid pattern marked with the white asterisk suggesting northwest-southeast along-shore syndepositional current. (c) Stratigraphically deep proportional stratal slice exhibiting chaotic facies...

... by Bonaduce et at -(1980) from the Gulf of Aqaba (Red Sea). In so far as the Indian region is con-cerned, two species have been recorded. .They are Loxoconchella anomala from the Recent sediments of Sri Lanka (Scott, 1905) and Mandvi Beach (Jain) 1978), and L. honoluliensis from the Miocene beds of Andaman...

..., 1981 ; Frey et al., 1984 ; Duncan, 1986 ; Frey and Pemberton, 1987 ). Studies of modern burrowing activity have helped develop a general understanding of the paleoecology of ancient deposits marked by the presence of crab burrows ( e.g., Stephenson, 1965 ; Frey and Mayou, 1971 ; Curran and Frey...

..., NO. 1 (MARCH, 1996), P 72-81 Reef styles of modern carbonate platforms PAUL M. HARRIS Chevron Petroleum Technology Company 1300 Beach Boulevard La Habra, California 90633-0446 ABSTRACT Modern areas of carbonate deposition illustrate the distribution of carbonate facies within an overall depositional...

...Satish C. Singh Fig.5. Deep seismic reflection image of faults in the Wharton Basin. The arrows mark the position of the deep penetrating fault (modified from Qin and Singh, 2015 ). Yellow line marks the oceanic Moho. The bathymetry and seismic reflection data were acquired...

... organisms inhabitate the tidal flats and beaches of the modern sea in different parts of the world. Deep vertical burrowing is characteristic of intertidal sediments (Rhoads, 1967) and in the present case the Thalassinoides burrows with more than 1 meter vertical shafts are recorded. JabaJpur Formation...

... at beach under the influence of strorms ( Flugel, 2010 ). The presence of oxidised sediments and carbonaceous shale, and goethised pyrites represent a tidal flat marked with swamps and confined water bodies with restricted water circulation. The siliciclastic sediment dominated lower portion of Lower...

... intertrappean deposits of the Ajanta Formation of the Sahyadri Group and the Mohgaon Kalan intertrappean deposits of the Amarkantak Group. 4. Farabeipollis Nandi & Chattopadhyay 2002 Pollen grains rhomboidal in shape in equatorial view with triangular pole-to-pole flap-like...

... macrolepidotus and Osteolepis microlepidotus . No specimens were figured or even alluded to. The only information given by Sedgwick and Murchison (1829) was that the scales were similar to those of the living bony fish Lepisosteus , which has shiny rhomboidal scales. They differentiated between their two...

.... 19 D), rhomboid ( Fig. 19 E), straight-crested ( Fig. 19 F, G), sinuous ( Fig. 19 F), undulatory ( Fig. 19 H), and linguoid ( Fig. 20 A). Modified ripples ( Fig. 20 A), drainage lines ( Fig. 20 B), and interference marks ( Fig. 20 C) are widespread across the studied successions. Flattened ripples...

... has an area and altitude of approximately 7.66 km 2 and 513.6 m, respectively (Yang et al . 2019 ; Zhang et al . 2019 ). Lingshan Island, originated from compression and tilt (Luan et al . 2010 ), is marked by a set of thick rhyolites developed in the middle of Lingshan Island. The lower part...

... ripple shows rippled sandstone surface marked by loading features related to a thin veneer of overlying sandstone ( Fig. 4A ). The evidence for soft sediment deformation of the lower sandy bed and the lack of amalgamation of the two sandy layers is indicative of the presence of mat to provide flexibility...

... sandstone seals the reservoir, which consists of four major internal fades. A diporiented distributary system carried sediment into the basin. Sediment was then transported along strike (dominantly to the southwest) by longshore drift. Wave action reworked the sands into a beach-ridge plain. The resultant...

... of the stratigraphic section (from 0 to 2 m) displays plurimetric dunes showing large megaripple marks and oblique stratification (Fig.  2 ). These dunes correspond to F1 which consists of yellow to grey mudstone–packstone sandy dolomite locally yielding breccia and coquina lenses (Fig.  3 c–d; Table  1 ). F1...

...Mark R. Legg, M.EERI; Jose C. Borrero; Costas E. Synolakis We investigate the tsunami hazard associated with the Catalina Fault offshore of southern California. Realistic faulting parameters are used to match coseismic displacements to existing sea floor topography. Several earthquake scenarios...