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107-15 A Study of the Coll de Montllobar to Further Characterize Channelization as the Units Shift Through Transgressive-Regressive Sequences

Session: Sedimentary Geology Division/SEPM Student Research Poster Competition: Dynamics of Stratigraphy and Sedimentation

Poster Booth No.: 158

Presenting Author:

Samuel Knox

Authors:

Knox, Samuel Shane ¹, M Holbrook, John M.², Van Yperen, Anna³, More, Miguel Poyatos⁴, Midtkandal, Ivar⁵

(1) Department of Geological Sciences, Texas Christian University, Fort Worth, Texas, USA, (2) Department of Geological Sciences, Texas Christian University, Fort Worth, TX, USA, (3) Department of Geoscience, University of Oslo, Oslo, Norway, (4) Faculty of Earth Science, University of Barcelona, Barcelona, USA, (5) Department of Geosciences, University of Oslo, Oslo, Norway,

Abstract:

The Tremp-Graus basin, located in Northern Spain, is a foreland piggyback basin that sits on the foot of Pyrenees Mountains north of the Montsec thrust belt. The basin is the result of an east-west trending syncline between the Boxial and Montsec Thrusts, North and South of Tremp, Spain, respectively. During the end of the Cretaceous period, syntectonic sedimentation began and carried throughout the Miocene forming the basin. The Tremp-Graus basin is structurally open in the west and closed in the east, possibly due to structural events and quite possibly a shallow sea that protruded the area during the Ypresian (56 – 47.8 Ma). The Pyrenees Mountains to the north are the main source of the sedimentation in the area as the thrust sheets became proximal to the basin. The Boxial thrust supplied alluvial fans during the Maastrichtian in a localized setting (Arevalo, 2022; Busquests, 2022).

This study will focus on a vertical section in the Coll del Montllobar Cliffs to identify sequence boundaries in outcrop. Processing high resolution sedimentary fluvial architecture as the rocks shift from continental/terrestrial deposits to marine influence deposits within the Upper Ager Group through the Lower Montanyana Group is necessary to understand how channel characteristics differ through vertical section. The study will include 6 detailed measured sections, fluvial mapping conducted through drone footage, 3D modeling and stable isotope analyses on carbonates to identify paleoclimate and depositional environment. The conclusion will provide a basic understanding of how transgressive – regressive cycles alter channel behavior within the region, as well as the defining characteristics of the fluvial channels as the system transitions from tidal influence to non-tidal influence.

Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025

doi: 10.1130/abs/2025AM-8896

A Study of the Coll de Montllobar to Further Characterize Channelization as the Units Shift Through Transgressive-Regressive Sequences

Description

Session Format: Poster

Presentation Date: 10/20/2025

Presentation Room: HBGCC, Hall 1

Poster Booth No.: 158

Author Availability: 9:00–11:00 a.m.

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