Tyson Smith | University of Houston (original) (raw)
Address: Houston, Texas, United States
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Cyclothems are a characteristic feature of Pennsylvanian Appalachian basin stratigraphy. These hi... more Cyclothems are a characteristic feature of Pennsylvanian Appalachian basin stratigraphy. These high frequency transgressive-regressive cycles have been attributed to glacioeustatic fluctuation, but comparatively little work has been done until recent with regards to identification of similar cycles in the upper Mississippian despite the presence of continental ice sheets during that time. This study provides evidence for the presence of high frequency, transgressive-regressive cycles during the late Mississippian, similar to Pennsylvanian cyclothems. The eight trangressive-regressive episodes identified within the study interval occurred over a roughly 2.5 million year span in the late Mississippian. Assuming that these are cyclic in nature, they exhibit a 4th order periodicity of ~300 thousand years. The character of these cycles appears to be modulated by a 3rd order lowstand and transgressive trend. This study documents how multiple controls on relative sea level, which operate o...
Geological Society of America Abstracts with Programs, 2020
This study aims to find out how to apply the Contextual Teaching and Learning (CTL). The type of ... more This study aims to find out how to apply the Contextual Teaching and Learning (CTL). The type of this research was Classroom Action Research with the technique of data collection through the activities of observation sheets and students' learning outcomes tests. The subject in this study were students of class VII B SMP Negeri 06 Bengkulu city even semester of academic year 2018/2019. The total subject were 19 people. The students activities was improved by making the LKPD that more interesting and reducing the material by adjusting learning time, directed the students to carefully read the steps of the activities of the LKPD, pointing randomly to groups to presented the results of future class discussions. The increase of the students in mathematics learning activities can be seen by the average value of the observation of the students in cycles I, II, and III respectively, were 20. 75, 25.5, 28 with the consecutive criteria, which are quite active, active and active. While the learning outcomes of the students can be improved by motivating the students interesting in learning, giving the practice questions. The improvement of the students learning outcomes can be seen from the average value of the learning outcomes in
Tectonophysics, 2019
Extension orientation is a key parameter in rift tectonics. While a clockwise rotation of the ext... more Extension orientation is a key parameter in rift tectonics. While a clockwise rotation of the extension orientation is widely accepted for the southern Rio Grande rift and the Basin and Range province in western U.S., in which direction(s) the northern Rio Grande rift opened has been controversial. Moreover, slip reorientation , a phenomenon caused by local stress rotation on weak faults under a unidirectional regional extension, imposes a serious impact on kinematic interpretations. We investigate the presently oblique Tusas-Abiquiu segment of the Rio Grande rift in north-central New Mexico to assess the rifting kinematics with the presence of pre-existing crustal weaknesses. Fault-slip data show an overall NE-SW extension on the NW-trending Tusas border faults, and WNW-ESE extension on the NNE-trending Abiquiu border and internal faults. The slip vectors on the border faults show a wide variety of oblique-slip component, whereas those on the internal faults are predominantly pure dip-slip. The majority of our field measurements can be reproduced by the slip reorientation model, although this model's setting does not satisfy regional geological records. Clockwise rotation of the extension axes from NE-SW to WNW-ESE can also explain our fault-slip data, as well as other structures in the rift. Tectonic reactivation during the extension also influenced the landscape evolution of the early rift. The Rio Grande rift shared similar extension orientation with the southern Basin and Range during the late Oligocene. The extensional strain field of the southwestern North American plate shows a progressive, time-transgressive rotational pattern, implying that plate boundary processes, instead of asthenospheric upwelling, governed the initiation and early evolution of this intracontinental rift.
Cyclothems are a characteristic feature of Pennsylvanian Appalachian basin stratigraphy. These hi... more Cyclothems are a characteristic feature of Pennsylvanian Appalachian basin stratigraphy. These high frequency transgressive-regressive cycles have been attributed to glacioeustatic fluctuation, but comparatively little work has been done until recent with regards to identification of similar cycles in the upper Mississippian despite the presence of continental ice sheets during that time. This study provides evidence for the presence of high frequency, transgressive-regressive cycles during the late Mississippian, similar to Pennsylvanian cyclothems. The eight trangressive-regressive episodes identified within the study interval occurred over a roughly 2.5 million year span in the late Mississippian. Assuming that these are cyclic in nature, they exhibit a 4th order periodicity of ~300 thousand years. The character of these cycles appears to be modulated by a 3rd order lowstand and transgressive trend. This study documents how multiple controls on relative sea level, which operate o...
Geological Society of America Abstracts with Programs, 2020
This study aims to find out how to apply the Contextual Teaching and Learning (CTL). The type of ... more This study aims to find out how to apply the Contextual Teaching and Learning (CTL). The type of this research was Classroom Action Research with the technique of data collection through the activities of observation sheets and students' learning outcomes tests. The subject in this study were students of class VII B SMP Negeri 06 Bengkulu city even semester of academic year 2018/2019. The total subject were 19 people. The students activities was improved by making the LKPD that more interesting and reducing the material by adjusting learning time, directed the students to carefully read the steps of the activities of the LKPD, pointing randomly to groups to presented the results of future class discussions. The increase of the students in mathematics learning activities can be seen by the average value of the observation of the students in cycles I, II, and III respectively, were 20. 75, 25.5, 28 with the consecutive criteria, which are quite active, active and active. While the learning outcomes of the students can be improved by motivating the students interesting in learning, giving the practice questions. The improvement of the students learning outcomes can be seen from the average value of the learning outcomes in
Tectonophysics, 2019
Extension orientation is a key parameter in rift tectonics. While a clockwise rotation of the ext... more Extension orientation is a key parameter in rift tectonics. While a clockwise rotation of the extension orientation is widely accepted for the southern Rio Grande rift and the Basin and Range province in western U.S., in which direction(s) the northern Rio Grande rift opened has been controversial. Moreover, slip reorientation , a phenomenon caused by local stress rotation on weak faults under a unidirectional regional extension, imposes a serious impact on kinematic interpretations. We investigate the presently oblique Tusas-Abiquiu segment of the Rio Grande rift in north-central New Mexico to assess the rifting kinematics with the presence of pre-existing crustal weaknesses. Fault-slip data show an overall NE-SW extension on the NW-trending Tusas border faults, and WNW-ESE extension on the NNE-trending Abiquiu border and internal faults. The slip vectors on the border faults show a wide variety of oblique-slip component, whereas those on the internal faults are predominantly pure dip-slip. The majority of our field measurements can be reproduced by the slip reorientation model, although this model's setting does not satisfy regional geological records. Clockwise rotation of the extension axes from NE-SW to WNW-ESE can also explain our fault-slip data, as well as other structures in the rift. Tectonic reactivation during the extension also influenced the landscape evolution of the early rift. The Rio Grande rift shared similar extension orientation with the southern Basin and Range during the late Oligocene. The extensional strain field of the southwestern North American plate shows a progressive, time-transgressive rotational pattern, implying that plate boundary processes, instead of asthenospheric upwelling, governed the initiation and early evolution of this intracontinental rift.