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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Structural evaluation of angular unconformities
 Pešata, Ondřej ; Peřestý, Vít (advisor) ; Rez, Jiří (referee)
Spatial relations between rock layers which are not stratigraphically, structurally, sedimentologically or paleontologically coherent are called unconformities. To be exact we refer to a plane localised between two unconformably deposited layers. This plane is also supposed to serve as a marker of processes which lead to a complete change of an environment on a regional scale at least. This thesis is devoted to a brief history of the recognition of unconformities, formation of unconformities by erosion agents and finally their classification and importance in structural geology. Particularly it focuses on angular unconformities for their easier identification in the field and at the same time for having fundamental tectonic significance. Angular unconformities represent important types of surfaces, because they are used to identify orogenic events, especially when polyphase deformation history is recorded by older strata (deposited beneath unconformity) as opposed to a simpler record of younger ones. Erosion is essentially related to unconformable surfaces as it creates new depositional areas (reliefs) for younger rock layers. For the purposes in this thesis we divide unconformities to "true" and "false". The "true" angular unconformities correspond to an orogenic event, while the "false" angular...
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