Africa and De viris illustribus were partially inspired by Petrarch's visit to Rome in 1337. According to Bergin and Wilson (p. ix). It seems very likely that the inspirational vision of the Eternal City must have been the immediate spur to the design of the Africa and probably De viris illustribus as well. After returning from his grand tour, the first sections of Africa were written in the valley of Vaucluse. Petrarch recalls
The fact that he abandoned it early on is not entirely correct since it was far along when he received two invitations (from Rome and from Paris) in September 1340 each asking him to accept the crown as poet laureate. A preliminary form of the poem was completed in time for the laurel coronation April 8, 1341 (Easter Sunday).
Africa is 2009 Perpetuum Jazzile album. By large most successful song from the album is a capella version of Toto's "Africa", the performance video of which has received more than 15 million YouTube views since its publishing in May 2009 until September 2013.
Africa is a 1930 Walter Lantz cartoon short featuring Oswald the Lucky Rabbit.
Oswald was riding through the Egyptian desert on his camel. The camel, though looking real on the exterior, is actually mechanical because of the two ball-shaped pistons inside which Oswald manipulates with his feet like bike pedals. One day, a lion was running toward them. To defend himself, Oswald brought out a rifle but it malfunctioned. As a final resort, Oswald fired the ball pistons from the camel like a cannon and aimed into the lion's mouth. Terrified by its lumpy back, the lion runs away in panic.
Nearby where he is, Oswald saw an oasis and a palace. Upon seeing the apes dance and play instruments, the curious rabbit decides to join the fun. As he entered the palace, Oswald was greeted by the queen. The queen asked him who he is, and Oswald introduced himself in a song as well as giving advice for a possibly better lifestyle. Pleased by his visit, the queen asked Oswald if he would like to be her king. Oswald was at first uncertain, knowing he never met a queen, but immediately accepted. It turns out momentarily that the queen still has a king who shows up then throws Oswald out of the palace and into a pond full of crocodiles. Luckily, Oswald escapes unscathed and runs off into the desert.
A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.
Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".
Sequences of sedimentary and volcanic rocks are subdivided on the basis of their lithology. Going from smaller to larger in scale, the main units recognised are Bed, Member, Formation, Group and Supergroup.
A bed is a lithologically distinct layer within a member or formation and is the smallest recognisable stratigraphic unit. These are not normally named, but may be in the case of a marker horizon.
A member is a named lithologically distinct part of a formation. Not all formations are subdivided in this way and even where they are recognized, they may only form part of the formation.