Sedimentology of surface sediments from the continental shelf and slope off West Africa (Table 1)

Samples from sutface sediments of the shell, continental slope, and adjacent deep sea regions off West Africa between 27° N and 15° N were investigated with respect to grain size distribution of the total samples, sand contents of the acid insoluble residues, carbonate content of the total samples, and the separate grain size fractions, specific surfaces, colours and mineralogical composition of the clay fractions. The grain size distributions of the total samples of the sediments of the shelf and the continental slope off Spanish-Sahara are controlled mainly by biogenic components. The supply of terrigeneous material in this area is very low. At deeper parts of the continental slope and in the deep sea areas, the relative amounts of carbonate minerals in the sediments are considerably reduced. The prevailing sand contents of the upper slope changes into clay dominance. On the shelf of Mauritania - represented by profiles extending down to 200 m water depth - the grain size is also controlled mainly by biogenic carbonates. Nevertheless, the admixture of fossil silicate components is important, too. The southern parts of the area is investigated are located in a region influenced by sediments of the Senegal River, which especially control the contents of silt and clay. The silicate sands, predominately of quartz, are fossil and form a mixed sediment with younger deposits. The carbonate contents of the different grain size fractions are formed either by sedimentation of carbonate and silicate particles of the respective grain size or by autochtonous disintegration of coarser sediment particles, as shown by the occurence of Mg-rich calcite and especially aragonite in the clay sized fraction. In the northern parts of the area investigated, which have very minute terrigeneous supply, the latter mechanism is the dominant factor, controlling the carbonate contents of the fine grain sized fractions. In the vicinity of the mouth of the Senegal the carbonate contents are influenced by extremely high dilution with terrigencous silicates. Mg-rich calcite and aragonite are produced preferentially in shallow slope and shelf areas up to 500 m of water depth. The specific surfaces of the carbonate-free clay fractions indicate that the clay fractions of the shelfareas with little terrigenous supply consits of relatively coarser particles. Very fine particles are removed and transported towards the deep sea. Lateral differentiation of this kind was not observed in the area off Senegal. The high surface areas, characterizing the clay fractions of this region, are thought to be due to high montmorillonite contents as was found for deep seas sediments. The mineralogical composition of the clay fraction from the southern parts of the area is characterized by high kaolinite and montmorillonite contents, while in the northern illite is predominating. At least two types of montmorillionites are present: in areas influenced by the Senegal mostly one type was found, which could swell to 17; on the shelves and slopes of the other regions the montmorillonite-group is represented by a montmorillonite-mica-type mixed-layer mineral. A "glauconite", found in the sand fraction, which had very similar properties to those of the montmorillonite-mica mixed-layer, is believed to be the source of this mixed-layer-type mineral. Palygorskite is present in all samples out of range of the Senegal supply. It may be an indicator of eolian transported material. The occurence of rich palygorskit deposits in the arid hinterlands emphasizes the terrestrial origin.

Chemical composition of plagioclase from DSDP Legs 45 and 46, Atlantic Ocean

Phyric basalts recovered from DSDP Legs 45 and 46 contain abundant plagioclase phenocrysts which occur as either discrete single grains (megacrysts) or aggregates (glomerocrysts) and which are too abundant and too anorthitic to have crystallized from a liquid with the observed bulk rock composition. Almost all the plagioclase crystals are complexly zoned. In most cases two abrupt and relatively large compositional changes associated with continuous internal morphologic boundaries divide the plagioclase crystals into three parts: core, mantle and rim. The cores exhibit two major types of morphology: tabular, with a euhedral to slightly rounded outline; or a skeletal inner core wrapped by a slightly rounded homogeneous outer core. The mantle region is characterized by a zoning pattern composed of one to several spikes/plateaus superimposed on a gently zoned base line, with one large plateau always at the outside of the mantle, and by, in most cases, a rounded internal morphology. The inner rim is typically oscillatory zoned. The width of the outer rim can be correlated with the position of the individual crystal in the basalt pillow. The presence of a skeletal inner core and the concentration of glass inclusions in low-An zones in the mantle region suggest that the liquid in which these parts of the crystals were growing was undercooled some amount. The resorption features at the outer margins of low-An zones indicate superheating of the liquid with respect to the crystal. It is proposed that the plagioclase cores formed during injection of primitive magma into a previously existing magma chamber, that the mantle formed during mixing of a partially mixed magma and the remaining magma already in the chamber, and that the inner rim formed when the mixed magma was in a sheeted dike system. The large plateau at the outside of the mantle may have formed during the injection of the next batch of primitive magma into the main chamber, which may trigger an eruption. This model is consistent with fluid dynamic calculations and geochemically based magma mixing models, and is suggested to be the major mechanism for generating the disequilibrium conditions in the magma.

Lucas' progressive drawing book, in three parts: : Part I--The principles of drawing in pencil, Part II--Colouring and shading in india ink, Part III--A treatise on perspective; : consisting chiefly of original views of American scenery, and embracing the latest and best improvements in the mode of instruction.

Poem "The colours" by E. Van Blon, part 2, p. [65]-66.

"The Pickwick club," a humoreske in two parts. String quartet [no. 3] (Op. 68)

"Synopsis" ([4] p.) inserted.

The redemption : a sacred trilogy /

For solo voices (SATB), chorus (SATB) and orchestra; English and French words.

Vier ernste Gesänge : für hohe Stimme mit Klavierbegleitung = 4 chants graves : pour voix elevée avec accompagnement de piano = 4 serious songs : for high voice with piano accompaniment : op. 121 /

German words with English translation.

Report of radiometric reconnaissance in Virginia, North Carolina, eastern Tennessee, and parts of South Carolina, Georgia, and Alabama.

"Contract Number AT (49-1) 860 - Mod. # 1-4."

Polyglot reader, and guide for translation : consisting of a series of English extracts, with their translation into French, German, Spanish, and Italian : the several parts designed to serve as mutual keys /

[v. 1] English text -- [v. 2] German translation / Reinhold Solger. 1867. -- [v. 3] Spanish translation. 1870. -- [v. 4] Italian translation / Vincenzo Botta. 1856.

Missa Fortuna desperata /

Latin words.

A natural history of uncommon birds, and of some other rare and undescribed animals : quadrupeds, fishes, reptiles, insects, &c. : exhibited in two hundred and ten copper-plates, ... In four parts /

"A Natural history of birds : most of wich have not been figur'd or describ'd ... : containing the figures of sixty birds and two quadrupedes ... / by Geroge Edwards ..."

Renaissance in Italy: Italian literature... in two parts.

Forms v. 4 of the author's "Renaissance in Italy."

The sacred and profane history of the world connected, from the creation of the world to the dissolution of the Assyrian empire at the death of Sardanapalus, and to the declension of the kingdoms of Judah and Israel under the reigns of Ahaz and Pekah: including the dissertation on the creation and fall of man.

"Illustrated with a new and correct set of maps and plans."

Rural oeconomy: or, Essays on the practical parts of husbandry. : Designed to explain several of the most important methods of conducting farms of various kinds; including many useful hints to gentlemen farmers relative to the œconomical management of their business ... : To which is added, The rural Socrates: being memoirs of a country philosopher. /

Verso of t.p. (p. [4] at front) blank.