ABSTRACT The increased use of complex programmatic workflows and open data within the Earth sciences has led to an increase in the need to find and reuse code, whether as examples, templates, or code snippets that can be used across projects. The “Throughput Graph Database” project offers a platform for discovery that links research objects by using structured annotations. Throughput was initially populated by scraping GitHub for code repositories that reference the names or URLs of data archives listed on the Registry of Research Data Repositories ( https://re3data.org ). Throughput annotations link the research data archives to public code repositories, which makes data-relevant code repositories easier to find. Linking code repositories in a queryable, machine-readable way is only the first step to improving discoverability. A better understanding of the ways in which data is used and reused in code repositories is needed to better support code reuse. In this paper, we examine the data practices of Earth science data reusers through a classification of GitHub repositories that reference geology and paleontology data archives. A typology of seven reuse classes was developed to describe how data were used within a code repository, and it was applied to a subset of 129 public code repositories on GitHub. Code repositories could have multiple typology assignments. Data use for Software Development dominated ( n = 44), followed by Miscellaneous Links to Data Archives ( n = 41), Analysis ( n = 22), and Educational ( n = 20) uses. GitHub repository features show some relationships to the assigned typologies, which indicates that these characteristics may be leveraged to systematically predict a code repository’s category or discover potentially useful code repositories for certain data archives.

ABSTRACT Two construction aggregate companies, Cemex and Hanson Aggregates, operate respective crushed stone quarries on the east and west slopes of Mount Zion in Clayton, California. These sidehill quarries utilize a single highwall and mine Jurassic diabase of the Coast Range ophiolite that formed as a sheeted dike complex. Hydrothermal veins, some containing 20%–30% disseminated pyrite and chalcopyrite, cut the diabase. The east quarry, operated by Cemex, was started by the Harrison-Birdwell Company in 1947. The west quarry, operated by Hanson, was started by the Henry J. Kaiser Sand and Gravel Company in 1954. The Cemex quarry highwall is visible as you come into the city of Clayton on Marsh Creek Road, with a height of ~280 m (920 ft). The height of the highwall at the Hanson quarry is ~215 m (700 ft). Both operations remove weathered diabase overburden to expose fresh diabase, which is drilled, blasted, and hauled to the plant for processing. To ensure aggregate is suitable for construction, quality assurance testing is conducted in accordance with the specifications of various agencies. These quarries supply the surrounding area with aggregate for hospitals, schools, highways, dams, and other buildings. Noteworthy projects supplied by the Clayton quarries include the Concord BART Station, Interstate-680, Interstate-580, Calaveras Dam, Sherman Island Levee, Highway 4, Highway 24, and Bay Bridge epoxy asphalt. Before aggregate was mined, Mount Zion was the site of a copper rush from 1862 to 1864. Gold and silver were also reported in various assays from the Clayton district. Although prospecting created excitement around Clayton, no productive orebodies were ever discovered.

ABSTRACT Mount Diablo is flanked on its northeast side by a thick section of Late Cretaceous and Tertiary sedimentary rocks, which produced small hydrocarbon accumulations in the Los Medanos, Willow Pass, Mulligan Hill, and Concord gas fields. The first well was drilled in 1864, and today most of the active wells on the northeast flank are used for gas storage by Pacific Gas and Electric Company. These fields, which also include the Brentwood oil field, lie to the northeast of Mount Diablo and have produced 6.4 million cubic meters (225 billion cubic feet) of natural gas and over 57 million cubic meters (9.1 million barrels) of oil. The main reservoirs for the Sacramento Basin are sandstones in the Late Cretaceous and Paleogene section. The source rock there is primarily from the Upper Cretaceous Dobbins Shale, which began generation 75 m.y. ago, and the Winters Shale, which began generation 35 m.y. ago. The Livermore Basin is located on the western and southwestern sides of the mountain. The only commercial field in that basin is the small Livermore oil field. This field produces primarily from Miocene sandstones. The Livermore Basin is a Neogene basin that was syntectonically formed in the last few million years and continues to grow today. Studies of the black oils found in the Livermore field show that the source rock is likely the Eocene Nortonville Shale, though the Upper Cretaceous Moreno shale is also considered to be a possible source. The Livermore field has produced 12 million cubic meters of oil (1.9 million barrels).

ABSTRACT We extend a published 9000 yr fire history record from Little Lake, in the Oregon Coast Range, to 35,000 yr and compare it with the established pollen record from the site. The fire history is based on a high-resolution analysis of charcoal preserved in lake sediments, providing a fire history record that spans the Last Glacial Maximum in North America. The data enabled us to address questions regarding the interactions between large-scale climate changes associated with the shift from glacial to interglacial conditions and the accompanying changes in forest vegetation and fire regimes. The vegetation history indicates a change from open subalpine forests to closed western hemlock and Douglas fir forests as climate moved from cold and dry full glacial to warm and wet Holocene conditions. The fire history indicates that although there was more biomass burned in the Holocene, the frequency of fires between glacial and interglacial conditions was not significantly different, and the fire frequency did not change in concert with regional shifts in vegetation. This suggests that fire is a product of seasonal or multiyear variations in climate that may not cause significant shifts in vegetation. Also, as this short-term climate variability becomes more common in the near future, conditions for fires in these mesic forests may become more common as well.

ABSTRACT While drought represents a serious threat to the Pacific southwestern United States, floods represent an equally formidable threat. This risk is so significant that the U.S. Geological Survey created the ARkStorm Project. This project aims to prepare California for a future storm(s) on the scale of the disastrous A.D. 1861–1862 events. Unfortunately, our knowledge of premeasurement floods in the Pacific southwestern United States is sparse. To date, the best paleoflood record consists of flood layers in the Santa Barbara Basin, spanning the past 9000 calendar yr B.P. (cal yr B.P.). As an alternative to marine archives, the lakes of the Pacific southwestern United States represent untapped resources for possible premeasurement flood reconstructions. Here, we present evidence for a flood between ca. 4860 and 4820 cal yr B.P. using sediment from Lake Elsinore core LEGC03-4. Core LEGC03-4 is predominantly clayey silt with occasional sandy silt units of variable centimeter-scale thickness. Here, we focus on a specific core section between 350 and 315 cm, where an ~11-cm-thick “unusual” sediment unit (330–319 cm) is well preserved and complete. The core section was analyzed for a variety of physical and chemical properties, including magnetic susceptibility, loss-on-ignition (LOI) at 550 °C and 950 °C, grain size, C org :N total ratios, and δ 13 C (bulk organic matter) . The unit is characterized by an erosional basal contact and microflame structures. It is normally graded, with laminae occurring in the upper section of the unit. It contains predominantly terrestrial organic matter, and the upper boundary is gradational. It is coeval with the fourth highest sand peak in a previously dated central basin core. Consequently, it is our conclusion that the unusual sediment unit represents a turbidite associated with a large flood-producing precipitation event with a maximum limiting age between 4860 and 4820 cal yr B.P.

Abstract Social development and rapid growth in the world's population has followed a remarkable technological development the past hundred years. Revolutions in agriculture and industry, medical innovations and new production technologies, have led to an increased standard of living for a larger part of the Earth's population. Megatrends for future developments are lining up and predictions for the next 40 years are numerous. Most ideas about our future societies imply new and innovative geo-scientific achievements. Towards 2058, we will have virtually surveyed and mapped every corner of the Earth. We will have detailed 3D images of the urbanized areas, and 4D models to assist to make reliable forecasts in a world of increased pressure on the natural resources and changing ecosystems. By 2058 the Green Stone Age is established, and we will use all elements in the periodic system and more rare minerals to support new materials and technological solutions. The major energy supplies will be CO 2 free. The agriculture will be more efficient, distribution and consumption of food will be more rational, and we will harvest from more marine food chains than today. More than 70% of the people on Earth will live in megacities and urban areas. Our cities will become smarter and greener, cars and public transport will be self-driving and autonomous tools using artificial intelligence to automate functions previously performed by humans. Substantial resources will be used to repair damaged ecosystems, and most important, we will use materials and products that have fewer negative consequences for the environment. The 17 UN goals for sustainable development are guidelines into the future, and geological surveys should serve as key instruments in the transformation into smarter and more sustainable societies. We are already on our way providing critical minerals for low carbon energy solutions, marine knowledge for blue growth, plans for green and smarter cities, and advanced digitalization for public services, as shown by examples in this present paper.

Abstract The Geological Survey of Canada (GSC) has been furthering the geoscientific understanding of Canada since its inception in 1842, the equivalent of seven generations ago. The evolution of the activities of the GSC over this period has been driven by evolving geographic, economic and political contexts and needs. Likewise, new technologies and evolving scientific methods and models shaped broadly the successive generations of GSC geoscience activities. The most recent GSC generation presented a mixed portfolio of large framework mapping geoscience programmes, and more targeted, hypothesis-driven geoscience research, and the development of decision support products for a range of government, industry and other stakeholders needs. Entering its eighth generation, the GSC and related organizations are embracing digital technologies for applications such as the evaluation of mineral resource potential, the evaluation of risks and the early warning of earthquakes. In order to do so, the GSC will need to develop new methods and systems in co-operation with other geological survey organizations, and target its data acquisition and research to further advance its ability to respond to the evolving needs of society to navigate geology through space and time, from the past to the present, and from the present to the future.

Abstract This short article provides my views – and not necessarily views that are shared by the British Geological Survey, where I was executive director from 2006–19, or by the Earth science community in general. I have outlined some of the trends that I see as important for the geosciences, largely from a solid-Earth perspective. I stress that fundamental discovery science in this sector must be, and will largely continue to be, led by the academic community but that Earth sciences research needs to be more focused on problem solving rather than refining our knowledge of the problems that face the Earth system. Academics and government laboratories have distinct but complementary roles in the pursuit of discovery and in applied geoscience research and training of geoscientists.

Abstract A holistic understanding of the oceans as part of the Earth system is imperative for the future management and sustainable utilization of the ocean's natural resources. Increasing pressures on global resources have been accompanied by important advances in acoustic remote sensing technologies, allowing us to map the seabed in unprecedented detail. The MAREANO (Marine areal database for Norwegian waters) programme in Norway, one of the world's largest seabed mapping programmes, is designed to close the knowledge gaps with the use of the new technologies. To date, since the start in 2005, c. 1170 million NOK (Norwegian kroner), equivalent to c. US$115m have been allocated to this programme (2005–20). This paper outlines the development of MAREANO and other large marine mapping and science programme proposals in Norway, and considers which factors influenced whether they were realized or not. In conclusion, funding of MAREANO came as a result of the convergence of political needs, technical capacity and multi-institutional co-operation. We further give an overview of the new and improved seabed mapping technologies, and finally we discuss the Norwegian programmes in connection with similar major international ongoing programmes and new initiatives and take a look at possible advances in future seabed mapping.

Abstract The China Geological Survey (CGS) is affiliated to the Ministry of Natural Resources of the People's Republic of China, and is responsible for the unified deployment, organization and implementation of basic, public and strategic geological surveying and mineral exploration, providing basic geological data and information for economic and social development, and responding to public demands. Over the past 20 years, the CGS has been focusing on the national key development strategies and undertaking geological surveys to support the nation's resources and energy security, regional economic development, disaster prevention and mitigation, poverty alleviation, and other related undertakings. Specifically, the CGS has been playing a role in the following areas: assessment of mineral resources, energy resources, urban geology and geo-environment, as well as offering update and application of geodata for public and several other services.

Abstract The Geological Survey of Finland (GTK) has over 130 years of history in mapping and studying mineral resources and their sustainable use. This has resulted in a globally top-ranking geodatabase and profound knowledge of Finnish geology and mineral resources, and has had a crucial impact on the continuously developing mining and exploration business in Finland. The basic mandate of the GTK has remained the same, but the strategic focus and mode of operation have changed considerably to meet new demands. Today, the GTK plays a vital role in providing geoscientific expertise and specialist services for a wide range of stakeholders and commercial clients in government, the business sector, academia and the wider community, in Finland and internationally. The GTK is actively building new ways to co-operate with universities, research organizations and companies to support future development and to expand its own expertise. This is further supported by the proactive use of cutting-edge technologies, such as the geomaterials research infrastructure, which allows studies from the nanoscale up to kilotons for diverse applications of mineral materials. The GTK plans to further strengthen its role as a key player in the minerals sector innovation ecosystems with a focus on primary minerals, the circular economy, digital solutions and water issues, which are expected to be essential factors for sustainable development through the 2020s and beyond. The GTK's main challenge is to ensure the continuous enhancement and renewal of expertise, to adapt and respond to future opportunities.

Abstract State Geological Surveys (SGSs) in the USA play vitally important roles, providing sound, unbiased scientific information to each state and the nation. Although implementation of each survey's scientific programme has evolved differently, these organizations are often the principal drivers of economic development, and they consult on policies for protecting land and water, mitigating geologic hazards and promoting sustainable development. The SGSs are represented by the American Association of State Geologists. For more than 110 years, they have partnered with the federal government on important geoscience issues concerning topographic and geologic mapping, water, mineral and energy resources, and geologic hazards. These collaborations continue to develop and expand across multiple specialties, providing critical support to the SGSs. The future role of SGSs will depend on legislative decisions, contributions to research and development and scientific advancement, and ability to leverage support from existing and new collaborations with academia and with federal, state, county and municipal agencies. The Illinois State Geological Survey, one of the largest SGSs, has continually pursued relationships across geoscience sectors to develop a strong multidisciplinary scientific programme. Going forward, all SGSs will be challenged to develop an effective data stewardship programme to communicate with a diverse clientele.

Abstract The Coordinating Committee for Geoscience Programmes in East and SE Asia (CCOP) is an intergovernmental geoscience organization based in Bangkok, Thailand. CCOP currently comprises 15 member countries in East and SE Asia; it has provided venues for various geoscientific programmes and activities in the region for over 50 years. At its inception, CCOP conducted work in geological surveys, exploration and technological cooperation in the extraction of off-shore petroleum and mineral resources in the region. In response to the needs of member countries, CCOP projects have become increasingly diverse over time, especially in the areas of groundwater resources, geohazards, global climate change and urban geology. Facing the imminent fourth industrial revolution, CCOP compiles, manages and utilizes large amounts of data collected and accumulated by its member countries, and increasingly focusses on data sharing, education and capacity building. With the vision of becoming a premier intergovernmental Earth science organization in East and SE Asia, CCOP's mission is the application of Earth science to make significant contributions to the economic development and sustainable environmental management of its member countries, enhancing their quality of life. To fulfil this mission, CCOP has developed four strategic foci: (1) outreach; (2) cooperation and partnership; (3) knowledge enhancement and sharing; and (4) data and information. Organization and management of CCOP are governed by a steering committee formed of permanent representatives from the 15 member countries and guided by recommendations from an advisory group comprising representatives from cooperating countries and organizations. The steering committee considers and endorses projects and activities planned and proposed by the technical secretariat, which oversees the management of the organization, implementing all approved plans for the benefit of all member countries as well as cooperating countries and organizations. CCOP has played important roles in providing venues for activities and collaboration on various Earth science topics, including energy and mineral resources, groundwater, geohazards, global climate change, urban geology, geoscience big data, education and outreach. CCOP also publishes regular and special publications describing its activities. In the future, CCOP will encourage non-members in the region to join as official member countries, and will further strengthen its network by conducting joint Earth science research projects with cooperating countries and organizations. CCOP will also pursue sustainability in research by establishing a system to continually nurture new Earth scientists. Furthermore, CCOP will build a cooperative network with geoscience communities in other regions to promote a sustainable Earth.

Abstract Cutting-edge techniques have always been utilized in petroleum exploration and production to reduce costs and improve efficiencies. Innovations in analytical methods will continue to play a key role in the industry moving forwards, as society shifts towards lower carbon energy systems. This volume brings together new analytical approaches and describes how they can be applied to the study of petroleum systems. The papers within this volume cover a wide range of topics and case studies, in the fields of fluid and isotope geochemistry, organic geochemistry, imaging and sediment provenance. The work illustrates how the current, state-of-the-art technology can be effectively utilized to address ongoing challenges in petroleum geoscience.