Search for: All records

Abstract The Central High Atlas Mountains of Morocco have an extensive record of Lower Jurassic deposits from the Tethyan Ocean. In the Amellago region, Ziz Valley, and Dadès Valley several fossilized reef outcrops preserve benthic foraminifera spanning the Pliensbachian and Toarcian stages. This study analyzes benthic foraminiferal assemblage changes across the bi-phased extinctions at the Pliensbachian/Toarcian boundary and the Jenkyns Event (also referred to as the Toarcian Oceanic Anoxic Event). In Pliensbachian samples, assemblages with abundant Glomospira sp., Glomospirella sp., Siphovalvulina sp., Haurania deserta, Placopsilina sp., Mesoendothyra sp., and Everticyclammina praevirguliana are observed. Following both the Pliensbachian/Toarcian boundary event and the Jenkyns Event, benthic foraminiferal density, evenness, and species richness decreased, indicating these communities underwent ecologic stress; however, loss of diversity was most substantial between samples that pre-date and post-date the Jenkyns Event. Whereas the Pliensbachian/Toarcian boundary event coincides with the demise of the large benthic foraminifera Mesoendothyra sp. and Everticyclammina praevirguliana, the Jenkyns Event was detrimental for most clades of benthic foraminifera, including many small, resilient taxa. Based on the evidence provided, we suggest that the Pliensbachian/Toarcian boundary and the Jenkyns Event were distinct events, potentially caused by distinct environmental perturbations. 

Morocco offers a wealth of biological, geological, and cultural diversity. This manuscript focuses on strengthening the information about the geological heritage in the northeastern part of the Central High Atlas, south of Midelt City, in the Drâa-Tafilalet region. This work consists of identifying, characterizing, and quantifying the significance of twelve sites of geological interest in the Tizi N’Talghemt area. The quantitative analysis is based on each site’s scientific value, potential for educational and tourist use, and degradation risk. Four Geosites with very high scientific value and eight Geodiversity sites with considerable potential for academic and tourist activities have been identified. All sites offer significant scientific, educational, and tourist potential and deserve rigorous protection to prevent degradation. Our goal is to expand the strategy of the Moroccan National Program for Geology MNPG-2030 and reinforce UNESCO’s guidelines for preserving the national geological heritage. Incorporating our conclusions into local and regional development plans will help raise the region’s visibility and enhance its attractiveness while preserving these endangered geological treasures. Our recommendations are meant to promote and protect the area’s geological heritage; they represent a crucial tool that local decision-makers should consider when planning the region’s development in the future. 

Reef communities changed dramatically during the Early Jurassic as they recovered from the End-Triassic Mass Extinction. The Atlas Rift Zone in Morocco provided expansive shallow water substrate, which allowed a variety of reef communities to develop, such as lithiotid bivalves that established themselves as new and prolific reef builders alongside corals, microbialites, and sponges in the Sinemurian and Pliensbachian stages. To better understand the dynamics between these reef builders and their environments, a detailed facies analysis of upper Pliensbachian reefs and a quantitative analysis of their composition was undertaken. We describe two distinct environmentally controlled reef types in the Central High Atlas Mountains. Lithiotid bivalves dominated reef construction in lagoonal environments and, together with phaceloid corals, commonly built bioherms and biostromes that ranged from 1 to 2 m tall and up to several hundred meters wide. Meanwhile, on the platform edge, microbialites, corals, and sponges constructed patch reefs up to 7 m tall and 20 m wide. These two reef types share common facies, as many of the same reef inhabitants, and some framework builders, grew in both environments. Despite the facies overlap, the communities in these two environmental settings are distinct, which is likely a result of environmental controls on the dominant reef framework builders. Moderately turbid waters and soft substrate in lagoons were ideal conditions for lithiotids but excluded many corals, sponges, and microbialites. Conversely, the clear, oligotrophic waters at the platform edge allowed photosynthetic and photosymbiotic organisms to thrive (e.g., coral and microbial reefs), while firmer substrate and higher wave energy may have prevented lithiotids from establishing dense populations. 

The Tinghir-Dades-Imilchil area is a geosite of high scientific, educational, and touristic values in the Draa-Tafilalet Region, Southeast Morocco. It has a rich geodiversity, including mountain ranges, plains, deserts, plateaus, and coasts, offering geomorphological and panoramic views, oases, lacks, and unique geological features (e.g., structural geology, sedimentology, petrogra-phy, paleontology, and hydrogeology). This paper focuses on the inventory and quantitative as-sessment of 25 sites of geological interest using the global methodology based on scientific value (SV), potential educational use (PEU) and potential touristic use (PTU), and degradation risk (DR) of each site. Indeed, SV is very high for 15 sites, high for 9 sites, and moderate for 1 site; PEU is very high for 21 sites and high for 4 sites; PTU is very high for 8 sites and high for 17 sites; and DR is high for 10 sites and moderate for 15 sites. Thus, 15 geosites (sites with very high SV values) and 10 geodiversity sites (sites with very high PEU or PTU values) are identified. These sites show highly significant scientific, educational, and touristic potentialities that should be valued and protected from degradation. Our work fits in well with the National Program of the Geology of Morocco-2030 strategy and the UNESCO directives, which aim at the inventory, awareness, valorization, and preservation of geological heritage. In addition, identi-fying and valuing these sites will help increase the area's attractiveness, preserve the environ-ment, and protect and enhance the region's geological history by introducing the geoheritage concept into its local and regional development plans. Suggested recommendations for their valorization and preservation constitute a valuable tool for local stakeholders to program their future sustainable actions and to improve the living conditions of the local population by creating new employment opportunities. 

Educational geoscience games have been increasing in popularity because they promote learning through amusement and encourage students to engage with topical material and each other. Here we describe a new board game, “Reef Survivor”, and its use as an instructional tool in undergraduate classes. The educational objective is to teach players about ecology, evolution, and environmental perturbations, while the gameplay objective is to build a resilient reef ecosystem. Through collaborative and competitive gameplay, students learn about evolution mechanics—mutation, migration, and natural selection—as well as ecology and how reefs survive natural disasters. The game blends informed decision making and chance to encourage students to learn and model complex Earth systems and evolutionary processes. Students choose their environment and reef community, whereas chance influences mutations and disasters. The game was incorporated in undergraduate classroom activities in 2021 and 2022 at 20 colleges and universities, mostly public institutions in the United States. Students were enthusiastic about the game, with two thirds saying they would rather play the game than have a normal lab. Notably, students said playing with a peer helped them learn better. Taken together, learning gains from 15 institutions were pos­itive, with significant gains by the final semester of assess­ment. Overall, learning gains were not positive during the first deployment (online) but improved substantially when refined and played in person. A print-and-play version of the game (doi: 10.18738/T8/S3KWT7), onboarding and follow-up assignments, and suggested extension activities are provided; modifications for time, course objective, and edu­cational level are also discussed. 

Abstract During the Early Jurassic, reefs in the shallow seas of the Atlas Rift experienced substantial changes as they recovered from the end-Triassic mass extinction. Excellent Lower Jurassic reef deposits documenting this change occur in the Central High Atlas region of Morocco, and herein we describe Owl Olistolith, a micro-olistolith found in lower Pliensbachian-aged (∼ 188.7 million years ago) Moroccan strata. The olistolith records the composition of a reef that grew within the Atlas rift zone and represents a snapshot of reef recovery ∼ 10 million years after the end-Triassic mass extinction. Owl Olistolith is derived from a reef that was originally situated on an outer platform within fair weather wave base; it broke loose and was transported to deeper water and deposited amongst marls. Corals and microbialites formed the primary framework of the reef; microproblematica, foraminifera, and other minor components were also present. The reef can be divided into two dominant facies: a microbialite facies that contains no corals (54%–94% microbialites), and a coral-microbialite facies with substantial proportions of both microbialite (23%–50%) and corals (14%–72%). The micro-olistolith contains at least 15 distinct coral types. In this study, seven coral genera were identified, three of which represent taxa that span the Triassic/Jurassic boundary, including Coryphyllia, Stylophyllopsis, and Margarosmilia. These results indicate that, although surviving taxa played a significant role, newly evolved corals were the most important taxa in the reestablishment of reef ecosystems in the Early Jurassic of Morocco.