The San Francisco 49ers have announced that tackle Jonas Jennings’ contract has been terminated. Jennings signed with the Niners in 2005 as a free agent. His time in San Fran was marred by injury. In his first year, Jennings played in only three games. In 2007, he was limited to five games. Last year, he played in only two games. The only exception was 2006, during which Jennings started 13 games. Before joining the 49ers, he started 52 games in four seasons with the Bills. Jennings was under contract through 2011, and he was due to earn base salaries of $4.2 million, $4.3 million, and $5.15 million in each of the next three years.