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Studies conducted by MGS of Fenwick, Weaver, and Isle of Wight Shoals show four general patterns of substrate conditions: 1) Shoal crest - generally is restricted to the undisturbed shoal crest at depths less than 35 it (11.2 m) and, has no discernable bedforms; Shoal crests consist of sand with almost no shell material; Coarser gravels are concentrated in areas of greatest wave and current energies, such as along the shoal crest. 2) Flank- bottom class associated With the shoal crest; primarily found along the shoal flanks between -35 ft and -40 ft, representing transitional bottom, from shoal crest to intershoal bottom type; sand, the texture of which may or may not be significantly different than that of the shoal crest; occasional ripples; sand with some shell and other biogenic materials. 3) Intershoal-associated with the deeper sea bottom (> 40 feet), both disturbed (dredged) and undisturbed intershoal areas or troughs; sandy bottom dominated by small ripples (< 0.40 meter widths); sand with richer but not abundant benthos. 4) Patch \u2014 occurring in the deeper sea bottom (> 40 feet) in trough or intershoal areas; large patches, ~l00 it in diameter, associated with rippled bottom within the dredged area; interpreted to be soft, finer-grained sediment based on low backscatter intensity return; Patch-mat regions occur between shoals that have muddy substrates, abundant patches/mats of worm tube colonies, and shell beds. Refs: Army Corps of Engineers: Baltimore District, 2007 \u201cAtlantic Coast of Maryland Shoreline Protection Project General Reevaluation Study: Borrow Sources for 2010 \u2013 2044\u201d MMS, BOEM, VIMS, 2000 \u201cEnvironmental Survey of Potential Sand Resource Sites Offshore Delaware and Maryland\u201d", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857 }, "copyrightText": "DNR MGS, MD iMAP", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "drawingInfo": { "renderer": { "type": "uniqueValue", "field1": "name", "field2": null, "field3": null, "defaultSymbol": null, "defaultLabel": null, "uniqueValueInfos": [ { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 255, 255, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 0 ], "width": 0.4 } }, "value": "shoal crest", "label": "shoal crest", "description": "" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 168, 168, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 0 ], "width": 0.4 } }, "value": "shoal flank", "label": "shoal flank", "description": "" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 168, 112, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 0 ], "width": 0.4 } }, "value": "intershoal", "label": "intershoal", "description": "" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 115, 76, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 0 ], "width": 0.4 } }, "value": "patch_mat", "label": "patch_mat", "description": "" } ], "fieldDelimiter": "," }, "transparency": 0, "labelingInfo": null }, "defaultVisibility": true, "extent": { "xmin": -8346608.0901, "ymin": 4630980.8521, "xmax": -8334572.033600001, "ymax": 4651675.333999999, "spatialReference": { "wkid": 102100, "latestWkid": 3857 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "name", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": [ { "name": "OBJECTID", "type": "esriFieldTypeOID", "alias": "GIS Object ID", "domain": null }, { "name": "type", "type": "esriFieldTypeSmallInteger", "alias": "Type", "domain": null }, { "name": "name", "type": "esriFieldTypeString", "alias": "Name", "length": 50, "domain": null }, { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "GIS Shape", "domain": null }, { "name": "Shape.STArea()", "type": "esriFieldTypeDouble", "alias": "GIS Shape Area (m)", "domain": null }, { "name": "Shape.STLength()", "type": "esriFieldTypeDouble", "alias": "GIS Shape Length (m)", "domain": null } ], "geometryField": { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "GIS Shape" }, "indexes": [ { "name": "R604_pk", "fields": "OBJECTID", "isAscending": true, "isUnique": true, "description": "" }, { "name": "S594_idx", "fields": "Shape", "isAscending": true, "isUnique": true, "description": "" } ], "subtypes": [], "relationships": [], "canModifyLayer": true, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 5600, "supportsStatistics": true, "supportsAdvancedQueries": true, "supportedQueryFormats": "JSON, geoJSON", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsHavingClause": true, "supportsCountDistinct": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsPagination": true, "supportsTrueCurve": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": true }, "supportsDatumTransformation": true, "supportsCoordinatesQuantization": true }