| Description |
|---|
| Material: | Rock |
| Classification: | Not Provided |
| Field Name: | Not Provided |
| Description: | Dredge contains 41 rock fragments of various types. Roughly 50 % of the dredge is composed of basalt, 25 % of shale, 15 % of granite, and 10% of dacite. The smallest fragment measures 1.5 cm. x 1 cm. x .75 cm. and the largest 7 cm. x 4 cm. x 2 cm. In roundness, the fragments vary from subrounded to rounded. They are irregularly coated with bryozoans. 1. The basalt rocks can be divided into two main types. The first type includes the typical basalts the fragments that have a dark gray, fine-grained matrix. The second type is characterized by a fine-grained, green matrix. Occasional quartz crystals may be the only phenocrysts present (quartz less than 5 percent), or else the matrix may be full of phenocrysts of plagioclase and augite. There are 17 fragments in all. 2. The shale pebbles are gray and fine-grained on fresh surface. All are covered with 1-4 mm. of light brown clay that is mottled with iron oxide stains. Evidently the shale fragments were rolled in the clay. Several have elongate shape. The smallest measures 1.5 cm. x 1 cm. x .75 cm. There are 11 pieces of shale. 3. The granite fraction numbers 9 fragments. The smallest one has a size of 1.25 cm x 1.25 cm x .75 cm. Several of the fragments are fine-grained and could better be classed as rhyolites. 4. The last group includes two fragments of dacite. The smaller one has a size of 2 cm. x 1.5 cm x 1 cm. and the larger a size of 7 cm. x 3.5 cm. x 1.5 cm. Quartz, biotite, and hornblende can be distinguished in the matrices. The larger dacite fragment is thoroughly coated with two different species of bryozoa-one anastomosing, and the other circular in shape. |
| Age (min): | Not Provided |
| Age (max): | Not Provided |
| Collection Method: | dredge |
| Collection Method Description: | Not Provided |
| Size: | Not Provided |
| Geological Age: | Not Provided |
| Geological Unit: | Not Provided |
| Comment: | Not Provided |
| Purpose: | Not Provided |
| Geolocation |
|---|
| Latitude Start (WGS84): | -56.653 |
| Latitude End: | Not Provided |
| Longitude Start (WGS84): | -66.863 |
| Longitude End: | Not Provided |
| Northing (m) (UTM NAD83): | Not Provided |
| Easting (m) (UTM NAD83): | Not Provided |
| Zone: | Not Provided |
| Vertical Datum: | Not Provided |
| Elevation Start: | -1137 meters |
| Elevation End: | -1177 meters |
| Nav Type: | Not Provided |
| Physiographic Feature: | Not Provided |
| Name Of Physiographic Feature: | Not Provided |
| Location Description: | Not Provided |
| Locality: | Not Provided |
| Locality Description: | Not Provided |
| Country: | Not Provided |
| State/Province: | Not Provided |
| County: | Not Provided |
| City: | Not Provided |
| Collection |
|---|
| Field Program/Cruise: | VM15 |
| Platform Type: | Ship |
| Platform Name: | Vema |
| Platform Description: | Not Provided |
| Launch Type: | Not Provided |
| Launch Platform Name: | Not Provided |
| Launch ID: | Not Provided |
| Collector/Chief Scientist: | Not Provided |
| Collector/Chief Scientist Detail: | Not Provided |
| Collection Start Date: | 1959-03-13 |
| Collection End Date: | Not Provided |
| Curation |
|---|
| Current Archive: | Lamont-Doherty Earth Observatory (LDEO) |
| Current Archive Contact Details: | Not Provided |
| Original Archive: | Not Provided |
| Original Archive Contact Details: | Not Provided |
| Related Samples |
|---|
Parents: | No Parents | | Siblings: | No Siblings |
| Children: | No Children |
