Geological Map of Spain. Scale 1:50.000 - Sheet 61 - BILBAO

The sheet 61 (BILBAO) of the National Geological Map (MAGNA), was made in 1975 and published in 2011 by the Geological Survey of Spain. It is distributed at scale 50000. The geological map shows the nature of materials (rocks and sediments) that appear on the surface, their spatial distribution and geometric relationships between the different cartographic units represented. A geological mapping unit is the grouping of one or more lithologies with common age range, which is represented on the map at a scale or defined resolution. Each mapping unit, and the different geological structures, is represented on the map with a symbolism itself. The representation of these units on the topographic base map provides some three-dimensional information that is completed with other geological data and geological sections, stratigraphic profiles, polls, etc. The map legend is a pictogram representing the spatial relationship of the different mapping units (chronology, overlapping, geometric relationship, lateral facies changes, etc.). It also includes structural, hydrogeological and geological location of the sheet within the regional schemes. Since 1991, the Geological Map Series MAGNA is made inseparably with the geomorphological map on the same scale. This map incorporates everything on the surface geology and provides a structured and accurate information of the land forms. It is organized on the basis of morphogenesis and morphocronology incorporated the map using the corresponding chronostratigraphic column included in a table / legend inspired by the geological map. The forms, erosional and depositional, are represented on the map by individualized by symbols and patterns of color and surface deposits or lithological formations elements that provide information. For each sheet of the series MAGNA there is an explanatory report published, edited and in digital format. The digital information is stored in coverage and Shape format (ESRI). There is a guide that describes the physical structure of the digital information and its codification.西班牙地质调查局于1975年编制、2011年发布的国家地质图（MAGNA）第61幅（毕尔巴鄂幅），比例尺为1:50000。该地质图展示了地表出露的物质（岩石与沉积物）的性质、空间分布，以及所绘各制图单元间的几何关系。 地质填图单元是指具有共同年代范围的一种或多种岩性的集合体，以对应比例尺或既定分辨率在图上表示。每一个填图单元以及各类地质构造，均通过专属符号在图上表征。将这些填图单元绘于地形底图之上，可提供部分三维信息，此类信息可通过其他地质数据、地质剖面图、地层剖面、勘探孔等资料进行补充完善。该图的图例为象形图标，用以表征不同填图单元的空间关系（包括年代序、叠置关系、几何联系、侧向相变化等），同时还涵盖了区域格架内的构造、水文地质信息及该幅图在区域格架中的地质位置。 自1991年起，MAGNA系列国家地质图与同比例尺地貌图同步编制，二者不可分割。该套图件涵盖了地表所有地质信息，并提供了关于地表形态的结构化、精准化信息。其编制基于地貌成因与地貌年代学，并采用地质图配套的表格/图例中所附的对应年代地层柱作为参考依据。图中通过专属符号、色彩样式以及地表沉积物或岩性地层单元要素，对侵蚀与沉积成因的各类地貌形态进行个性化表征，以传递相关信息。 MAGNA系列的每一幅图幅均配有经编辑发布的数字版说明文档。 数字信息以Coverage格式与Shapefile格式（ESRI）存储，另有配套指南对数字信息的物理结构及其编码规则进行说明。