What does hummocky cross stratification indicate about the depositional environment?
Ripple bedding, hummocky cross stratification, parallel (horizontal) to low-angle lamination and erosion structures (e.g., gutter and pot casts) indicate a deposition as proximal tempestites above the fair-weather wave base with frequent influence of storms (Knaust and Langbein, 1995).
Is cross stratification a sedimentary structure?
In geology, cross-bedding, also known as cross-stratification, is layering within a stratum and at an angle to the main bedding plane. The sedimentary structures which result are roughly horizontal units composed of inclined layers.
How does cross stratification form?
Cross stratification forms under laminar flow conditions, either in water (rivers, deltas, beaches) or in air (sand dunes). As water or air flows into the lee side (downflow side) of an object it slows down, and some of the sediment that was in suspension will settle out.
What causes hummocky cross stratification?
Hummocky cross-stratification is a type of sedimentary structure found in sandstones. It is a form of cross-bedding usually formed by the action of large storms, such as hurricanes. It takes the form of a series of “smile”-like shapes, crosscutting each other.
What causes hummocky?
An extremely irregular surface may be called hummocky. An ice hummock is a boss or rounded knoll of ice rising above the general level of an ice-field. Hummocky ice is caused by slow and unequal pressure in the main body of the packed ice, and by unequal structure and temperature at a later period.
How does hummocky cross-stratification form?
What are common depositional environments?
There are 3 kinds of depositional environments, they are continental, marginal marine, and marine environments. Each environments have certain characteristic which make each of them different than others. And different depositional environment, will have different structure and texture of sediments.
What do ripple marks signify?
In geology, ripple marks are sedimentary structures (i.e., bedforms of the lower flow regime) and indicate agitation by water (current or waves) or wind.
